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Centrum voor Medico-Legale Psychologie
Conversietabel normen ...

CONVERSION TABLE FOR DERIVED SCORES

Adapted from Howard B. Lyman, Test Scores and What They Mean, Second Edition. Englewood Cliffs, N.J.: Prentice-Hall, Inc., 1971

z-Score

(X-M)/s

T-Score

(10z + 50)

Wechsler IQ

(15z + 100)

Stanford-Binet IQ

(16z + 100)

Scaled Score

(3z + 10)

Percentile Rank

3.00

80

145

148

19

99.9

2.95

79.5

144

147

--

99.8

2.90

79

144

146

--

99.8

2.85

78.5

143

146

--

99.8

2.80

78

142

145

--

99.7

2.75

77.5

141

144

--

99.7

2.70

77

141

143

--

99.6

2.65

76.5

140

142

18

99.6

2.60

76

139

142

--

99.5

2.55

75.5

138

141

--

99.5

2.50

75

138

140

--

99.4

2.45

74.5

137

139

--

99.3

2.40

74

136

138

--

99.2

2.35

73.5

135

138

17

99.1

2.30

73

135

137

--

98.9

2.25

72.5

134

136

--

98.8

2.20

72

133

135

--

98.6

2.15

71.5

132

134

--

98.4

2.10

71

132

134

--

98.2

2.05

70.5

131

133

--

98.0

2.00

70

130

132

16

97.7

1.95

69.5

129

131

--

97.4

1.90

69

129

130

--

97.1

1.85

68.5

128

130

--

96.8

1.80

68

127

129

--

96.4

1.75

67.5

126

128

--

96.0

1.70

67

126

127

--

95.5

1.65

66.5

125

126

15

95.0

1.60

66

124

126

--

94.5

1.55

65.5

123

125

--

93.9

1.50

65

123

124

--

93.3

1.45

64.5

122

123

--

92.6

1.40

64

121

122

--

91.9

1.35

63.5

120

122

14

91.2

1.30

63

120

121

--

90.3

1.25

62.5

119

120

--

89.4

1.20

62

118

119

--

88.5

1.15

61.5

117

118

--

87.5

1.10

61

117

118

--

86.4

1.05

60.5

116

117

--

85.3

1.00

60

115

116

13

84.1

0.95

59.5

114

115

--

82.9

0.90

59

114

114

--

81.6

0.85

58.5

113

114

--

80.2

0.80

58

112

113

--

78.8

0.75

57.5

111

112

--

77.3

0.70

57

111

112

--

75.8

0.65

56.5

110

110

12

74.2

0.60

56

109

110

--

72.6

0.55

55.5

108

109

--

70.9

0.50

55

108

108

--

69.2

0.45

54.5

107

107

--

67.4

0.40

54

106

106

--

65.5

0.35

53.5

105

106

11

63.7

0.30

53

104

105

--

61.8

0.25

52.5

104

104

--

59.9

0.20

52

103

103

--

57.9

0.15

51.5

102

102

--

56.0

0.10

51

102

102

--

54.0

0.05

50.5

101

101

--

52.0

0.00

50

100

100

10

50.0

-0.05

49.5

99

99

--

48.0

-0.10

49

98

98

--

46.0

-0.15

48.5

98

98

--

44.0

-0.20

48

97

97

--

42.1

-0.25

47.5

96

96

--

40.1

-0.30

47

96

95

--

38.2

-0.35

46.5

95

94

9

36.3

-0.40

46

94

94

--

34.5

-0.45

45.5

93

93

--

32.6

-0.50

45

93

92

--

30.8

-0.55

44.5

92

91

--

29.1

-0.60

44

91

90

--

27.4

-0.65

43.5

90

90

8

25.8

-0.70

43

90

89

--

24.2

-0.75

42.5

89

88

--

22.7

-0.80

42

88

87

--

21.2

-0.85

41.5

87

86

--

19.8

-0.90

41

87

86

--

18.4

-0.95

40.5

86

85

--

17.1

-1.00

40

85

84

7

15.9

-1.05

39.5

84

83

--

14.7

-1.10

39

84

82

--

13.6

-1.15

38.5

83

82

--

12.5

-1.20

38

82

81

--

11.5

-1.25

37.5

81

80

--

10.6

-1.30

37

81

79

--

9.7

-1.35

36.5

80

78

6

8.8

-1.40

36

79

78

--

8.1

-1.45

35.5

78

77

--

7.4

-1.50

35

78

76

--

6.7

-1.55

34.5

77

75

--

6.1

-1.60

34

76

74

--

5.5

-1.65

33.5

75

74

5

5.0

-1.70

33

75

73

--

4.5

-1.75

32.5

74

72

--

4.0

-1.80

32

73

71

--

3.6

-1.85

31.5

72

70

--

3.2

-1.90

31

72

70

--

2.9

-1.95

30.5

71

69

--

2.6

-2.00

30

70

68

4

2.3

-2.05

29.5

69

67

--

2.0

-2.10

29

69

66

--

1.8

-2.15

28.5

68

66

--

1.6

-2.20

28

67

65

--

1.4

-2.25

27.5

66

64

--

1.2

-2.30

27

66

63

--

1.1

-2.35

26.5

65

62

3

0.9

-2.40

26

64

62

--

0.8

-2.45

25.5

63

61

--

0.7

-2.50

25

63

60

--

0.6

-2.55

24.5

62

59

--

0.5

-2.60

24

61

58

--

0.5

-2.65

23.5

60

58

2

0.4

-2.70

23

60

57

--

0.4

-2.75

22.5

59

56

--

0.3

-2.80

22

58

55

--

0.3

-2.85

21.5

57

54

--

0.2

-2.90

21

57

54

--

0.2

-2.95

20.5

56

53

--

0.2

-3.00

20

55

52

1

0.1

 

Standard score to percentile conversion table


Z score

Standard score

Scaled score

T score

Percentile

Interpretation

3.70

155

20

87

99.99

Very superior

3.65

155

20

86.5

99.99

Very superior

3.60

154

20

86

99.98

Very superior

3.55

153

20

85.5

99.98

Very superior

3.50

153

20

85

99.98

Very superior

3.45

152

20

84.5

99.97

Very superior

3.40

151

20

84

99.97

Very superior

3.35

150

20

83.5

99.96

Very superior

3.30

150

20

83

99.96

Very superior

3.25

149

20

82.5

99.95

Very superior

3.20

148

20

82

99.93

Very superior

3.15

147

19

81.5

99.91

Very superior

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

3.10

147

19

81

99.91

Very superior

3.05

146

19

80.5

99.89

Very superior

3.00

145

19

80

99.87

Very superior

2.95

144

19

79.5

99.83

Very superior

2.90

144

19

79

99.83

Very superior

2.85

143

18

78.5

99.79

Very superior

2.80

142

18

78

99.74

Very superior

2.75

141

18

77.5

99.69

Very superior

2.70

141

18

77

99.69

Very superior

2.65

140

18

76.5

99.62

Very superior

2.60

139

18

76

99.53

Very superior

2.55

138

17

75.5

99

Very superior

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

2.50

138

17

75

99

Very superior

2.45

137

17

74.5

99

Very superior

2.40

136

17

74

99

Very superior

2.35

135

17

73.5

99

Very superior

2.30

135

17

73

99

Very superior

2.25

134

17

72.5

99

Very superior

2.20

133

17

72

99

Very superior

2.15

132

16

71.5

98

Very superior

2.10

132

16

71

98

Very superior

2.05

131

16

70.5

98

Very superior

2.00

130

16

70

98

Very superior

1.95

129

16

69.5

97

Superior

1.90

129

16

69

97

Superior

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

1.85

128

16

68.5

97

Superior

1.80

127

15

68

96

Superior

1.75

126

15

67.5

96

Superior

1.70

126

15

67

96

Superior

1.65

125

15

66.5

95

Superior

1.60

124

15

66

95

Superior

1.55

123

14

65.5

94

Superior

1.50

123

14

65

94

Superior

1.45

122

14

64.5

93

Superior

1.40

121

14

64

92

Superior

1.35

120

14

63.5

91

Superior

1.30

120

14

63

91

Superior

1.25

119

14

62.5

90

High average

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

1.20

118

14

62

88

High average

1.15

117

13

61.5

87

High average

1.10

117

13

61

87

High average

1.05

116

13

60.5

86

High average

1.00

115

13

60

84

High average

0.95

114

13

59.5

82

High average

0.90

114

12

59

82

High average

0.85

113

12

58.5

81

High average

0.80

112

12

58

79

High average

0.75

111

12

57.5

77

High average

0.70

111

12

57

77

High average

0.65

110

12

56.5

75

High average

0.60

109

12

56

73

Average

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

0.55

108

12

55.5

70

Average

0.50

108

11

55

70

Average

0.45

107

11

54.5

68

Average

0.40

106

11

54

66

Average

0.35

105

11

53.5

63

Average

0.30

104

11

53

61

Average

0.25

104

11

52.5

61

Average

0.20

103

11

52

58

Average

0.15

102

10

51.5

55

Average

0.10

102

10

51

55

Average

0.05

101

10

50.5

53

Average

0

100

10

50

50

Average

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

-0.05

99

10

49.5

47

Average

-0.10

98

9

49

45

Average

-0.15

98

9

48.5

45

Average

-0.20

97

9

48

42

Average

-0.25

96

9

47.5

39

Average

-0.30

96

9

47

39

Average

-0.35

95

9

46.5

37

Average

-0.40

94

9

46

34

Average

-0.45

93

8

45.5

32

Average

-0.50

93

8

45

32

Average

-0.55

92

8

44.5

30

Average

-0.60

91

8

44

27

Average

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

-0.65

90

8

43.5

25

Average

-0.70

90

8

43

25

Average

-0.75

89

8

42.5

23

Low average

-0.80

88

8

42

21

Low average

-0.85

87

7

41.5

19

Low average

-0.90

87

7

41

19

Low average

-0.95

86

7

40.5

18

Low average

-1.00

85

7

40

16

Low average

-1.05

84

7

39.5

14

Low average

-1.10

84

7

39

14

Low average

-1.15

83

6

38.5

13

Low average

-1.20

82

6

38

12

Low average

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

-1.25

81

6

37.5

10

Low average

-1.30

81

6

37

10

Low average

-1.35

80

6

36.5

9

Low average

-1.40

79

6

36

8

Borderline

-1.45

78

6

35.5

7

Borderline

-1.50

78

6

35

7

Borderline

-1.55

77

5

34.5

6

Borderline

-1.60

76

5

34

5

Borderline

-1.65

75

5

33.5

5

Borderline

-1.70

75

5

33

5

Borderline

-1.75

74

5

32.5

4

Borderline

-1.80

73

5

32

4

Borderline

-1.85

72

5

31.5

3

Borderline

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

-1.90

72

5

31

3

Borderline

-1.95

71

4

30.5

3

Borderline

-2.00

70

4

30

2

Borderline

-2.05

69

4

29.5

2

Inferior

-2.10

69

4

29

2

Interior

-2.15

68

4

28.5

2

Inferior

-2.20

67

3

28

1

Inferior

-2.25

66

3

27.5

1

Inferior

-2.30

66

3

27

1

Inferior

-2.35

65

3

26.5

1

Inferior

-2.40

64

3

26

1

Inferior

-2.45

63

3

25.5

1

Inferior

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

-2.50

63

3

25

1

Inferior

-2.55

62

3

24.5

1

Inferior

-2.60

61

2

24

0.47

Inferior

-2.65

60

2

23.5

0.38

Inferior

-2.70

60

2

23

0.38

Inferior

-2.75

59

2

22.5

0.31

Inferior

-2.80

58

2

22

0.26

Inferior

-2.85

57

1

21.5

0.21

Inferior

-2.90

57

1

21

0.21

Inferior

-2.95

56

1

20.5

0.17

Inferior

-3.00

55

1

20

0.13

Inferior

-3.05

54

1

19.5

0.11

Inferior

Z score

Standard score

Scaled score

T score

Percentile

Interpretation

-3.10

54

1

19

0.11

Inferior

-3.15

53

0

18.5

0.09

Inferior

-3.20

52

0

18

0.07

Inferior

-3.25

51

0

17.5

0.05

Inferior

-3.30

51

0

17

0.05

Inferior

-3.35

50

0

16.5

0.04

Inferior

-3.40

49

0

16

0.03

Inferior

-3.45

48

0

15.5

0.03

Inferior

-3.50

48

0

15

0.03

Inferior

-3.55

47

0

14.5

0.02

Inferior

-3.60

46

0

14

0.02

Inferior

-3.65

45

0

13.5

0.01

Inferior


Wij hebben een programma ontwikkeld dat voor u bij een gekend gemiddelde en een gekende standaarddeviatie van een ruwe score de volgende omgezette scores aangeeft: 

  • Percentielscore

  • z-score

  • T-score

  • IQ-Eguivalent

  • de NCE-score

  • De CEEB-score

  • de AGCT-score

Neem met ons contact op en we maken uw berekeningen. Contact

Er bestaat een Percentiel naar Z-score-calculator en een Z-score naar Percentiel-calculator, die we wel handig vinden.  

Z score Standard score Scaled score T score Percentile Interpretation
3.70 155 20 87 99.99 Very superior
3.65 155 20 86.5 99.99 Very superior
3.60 154 20 86 99.98 Very superior
3.55 153 20 85.5 99.98 Very superior
3.50 153 20 85 99.98 Very superior
3.45 152 20 84.5 99.97 Very superior
3.40 151 20 84 99.97 Very superior
3.35 150 20 83.5 99.96 Very superior
3.30 150 20 83 99.96 Very superior
3.25 149 20 82.5 99.95 Very superior
3.20 148 20 82 99.93 Very superior
3.15 147 19 81.5 99.91 Very superior
Z score Standard score Scaled score T score Percentile Interpretation
3.10 147 19 81 99.91 Very superior
3.05 146 19 80.5 99.89 Very superior
3.00 145 19 80 99.87 Very superior
2.95 144 19 79.5 99.83 Very superior
2.90 144 19 79 99.83 Very superior
2.85 143 18 78.5 99.79 Very superior
2.80 142 18 78 99.74 Very superior
2.75 141 18 77.5 99.69 Very superior
2.70 141 18 77 99.69 Very superior
2.65 140 18 76.5 99.62 Very superior
2.60 139 18 76 99.53 Very superior
2.55 138 17 75.5 99 Very superior
Z score Standard score Scaled score T score Percentile Interpretation
2.50 138 17 75 99 Very superior
2.45 137 17 74.5 99 Very superior
2.40 136 17 74 99 Very superior
2.35 135 17 73.5 99 Very superior
2.30 135 17 73 99 Very superior
2.25 134 17 72.5 99 Very superior
2.20 133 17 72 99 Very superior
2.15 132 16 71.5 98 Very superior
2.10 132 16 71 98 Very superior
2.05 131 16 70.5 98 Very superior
2.00 130 16 70 98 Very superior
1.95 129 16 69.5 97 Superior
1.90 129 16 69 97 Superior
Z score Standard score Scaled score T score Percentile Interpretation
1.85 128 16 68.5 97 Superior
1.80 127 15 68 96 Superior
1.75 126 15 67.5 96 Superior
1.70 126 15 67 96 Superior
1.65 125 15 66.5 95 Superior
1.60 124 15 66 95 Superior
1.55 123 14 65.5 94 Superior
1.50 123 14 65 94 Superior
1.45 122 14 64.5 93 Superior
1.40 121 14 64 92 Superior
1.35 120 14 63.5 91 Superior
1.30 120 14 63 91 Superior
1.25 119 14 62.5 90 High average
Z score Standard score Scaled score T score Percentile Interpretation
1.20 118 14 62 88 High average
1.15 117 13 61.5 87 High average
1.10 117 13 61 87 High average
1.05 116 13 60.5 86 High average
1.00 115 13 60 84 High average
0.95 114 13 59.5 82 High average
0.90 114 12 59 82 High average
0.85 113 12 58.5 81 High average
0.80 112 12 58 79 High average
0.75 111 12 57.5 77 High average
0.70 111 12 57 77 High average
0.65 110 12 56.5 75 High average
0.60 109 12 56 73 Average
Z score Standard score Scaled score T score Percentile Interpretation
0.55 108 12 55.5 70 Average
0.50 108 11 55 70 Average
0.45 107 11 54.5 68 Average
0.40 106 11 54 66 Average
0.35 105 11 53.5 63 Average
0.30 104 11 53 61 Average
0.25 104 11 52.5 61 Average
0.20 103 11 52 58 Average
0.15 102 10 51.5 55 Average
0.10 102 10 51 55 Average
0.05 101 10 50.5 53 Average
0 100 10 50 50 Average
Z score Standard score Scaled score T score Percentile Interpretation
-0.05 99 10 49.5 47 Average
-0.10 98 9 49 45 Average
-0.15 98 9 48.5 45 Average
-0.20 97 9 48 42 Average
-0.25 96 9 47.5 39 Average
-0.30 96 9 47 39 Average
-0.35 95 9 46.5 37 Average
-0.40 94 9 46 34 Average
-0.45 93 8 45.5 32 Average
-0.50 93 8 45 32 Average
-0.55 92 8 44.5 30 Average
-0.60 91 8 44 27 Average
Z score Standard score Scaled score T score Percentile Interpretation
-0.65 90 8 43.5 25 Average
-0.70 90 8 43 25 Average
-0.75 89 8 42.5 23 Low average
-0.80 88 8 42 21 Low average
-0.85 87 7 41.5 19 Low average
-0.90 87 7 41 19 Low average
-0.95 86 7 40.5 18 Low average
-1.00 85 7 40 16 Low average
-1.05 84 7 39.5 14 Low average
-1.10 84 7 39 14 Low average
-1.15 83 6 38.5 13 Low average
-1.20 82 6 38 12 Low average
Z score Standard score Scaled score T score Percentile Interpretation
-1.25 81 6 37.5 10 Low average
-1.30 81 6 37 10 Low average
-1.35 80 6 36.5 9 Low average
-1.40 79 6 36 8 Borderline
-1.45 78 6 35.5 7 Borderline
-1.50 78 6 35 7 Borderline
-1.55 77 5 34.5 6 Borderline
-1.60 76 5 34 5 Borderline
-1.65 75 5 33.5 5 Borderline
-1.70 75 5 33 5 Borderline
-1.75 74 5 32.5 4 Borderline
-1.80 73 5 32 4 Borderline
-1.85 72 5 31.5 3 Borderline
Z score Standard score Scaled score T score Percentile Interpretation
-1.90 72 5 31 3 Borderline
-1.95 71 4 30.5 3 Borderline
-2.00 70 4 30 2 Borderline
-2.05 69 4 29.5 2 Inferior
-2.10 69 4 29 2 Interior
-2.15 68 4 28.5 2 Inferior
-2.20 67 3 28 1 Inferior
-2.25 66 3 27.5 1 Inferior
-2.30 66 3 27 1 Inferior
-2.35 65 3 26.5 1 Inferior
-2.40 64 3 26 1 Inferior
-2.45 63 3 25.5 1 Inferior
Z score Standard score Scaled score T score Percentile Interpretation
-2.50 63 3 25 1 Inferior
-2.55 62 3 24.5 1 Inferior
-2.60 61 2 24 0.47 Inferior
-2.65 60 2 23.5 0.38 Inferior
-2.70 60 2 23 0.38 Inferior
-2.75 59 2 22.5 0.31 Inferior
-2.80 58 2 22 0.26 Inferior
-2.85 57 1 21.5 0.21 Inferior
-2.90 57 1 21 0.21 Inferior
-2.95 56 1 20.5 0.17 Inferior
-3.00 55 1 20 0.13 Inferior
-3.05 54 1 19.5 0.11 Inferior
Z score Standard score Scaled score T score Percentile Interpretation
-3.10 54 1 19 0.11 Inferior
-3.15 53 0 18.5 0.09 Inferior
-3.20 52 0 18 0.07 Inferior
-3.25 51 0 17.5 0.05 Inferior
-3.30 51 0 17 0.05 Inferior
-3.35 50 0 16.5 0.04 Inferior
-3.40 49 0 16 0.03 Inferior
-3.45 48 0 15.5 0.03 Inferior
-3.50 48 0 15 0.03 Inferior
-3.55 47 0 14.5 0.02 Inferior
-3.60 46 0 14 0.02 Inferior
-3.65 45 0 13.5 0.01 Inferior
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Stanines Definition

 

 

Voor wie meer in detail IQ's wil plaatsen ten overstaan van de normaalspreiding is onderstaande informatie relevant:

 IQ Percentile and Rarity Chart

These are IQs, their percentiles, and rarity on a 15 SD (e.g. Wechsler) and 16 SD (e.g. Stanford-Binet) scale.  They were calculated using the NORMDIST function in Excel.  The number of decimal places for the rarity was varied in the hope it might be useful.  You can see why presently nobody should be able to get a deviation IQ higher than 195 (or 201 on the 16 SD scale).  There are not enough people in the world to 'beat'. Note that rarities given are of people that have a certain IQ or higher. Some people might find it more useful to know the rarity of people that have a certain IQ or lower. In that case use this example as a guide: If you want to know how many people have IQs of 84 or lower, look at the rarity of people that have an IQ of 116 or higher.  (100 - 84 = 16.  100 + 16 = 116).

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

202
99.9999999995%

190,057,377,928

99.9999999908%

10,881,440,294

201
99.9999999992%

119,937,672,336

99.9999999862%

7,252,401,045

200
99.9999999987%

76,017,176,740

99.9999999794%

4,852,159,346

199
99.9999999979%

48,390,420,202

99.9999999693%

3,258,706,819

198
99.9999999968%

30,938,221,975

99.9999999545%

2,196,908,409

197
99.9999999950%

19,866,426,228

99.9999999327%

1,486,736,899

196
99.9999999922%

12,812,462,045

99.9999999010%

1,009,976,678

195
99.9999999880%

8,299,126,114

99.9999998548%

688,720,101

194
99.9999999815%

5,399,067,340

99.9999997879%

471,441,334

193
99.9999999717%

3,527,693,270

99.9999996913%

323,940,499

192
99.9999999568%

2,314,980,850

99.9999995524%

223,436,817

191
99.9999999345%

1,525,765,721

99.9999993536%

154,701,783

190
99.9999999010%

1,009,976,678

99.9999990699%

107,519,234

189
99.9999998511%

671,455,130

99.9999986669%

75,011,253

188
99.9999997770%

448,336,263

99.9999980964%

52,530,944

187
99.9999996674%

300,656,786

99.9999972920%

36,927,646

186
99.9999995062%

202,496,482

99.9999961624%

26,057,620

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

185
99.9999992699%

136,975,305

99.9999945820%

18,457,107

184
99.9999989254%

93,056,001

99.9999923799%

13,123,126

183
99.9999984250%

63,492,548

99.9999893231%

9,366,012

182
99.9999977016%

43,508,721

99.9999850966%

6,709,882

181
99.9999966604%

29,943,596

99.9999792755%

4,825,216

180
99.9999951684%

20,696,863

99.9999712895%

3,483,046

179
99.9999930398%

14,367,357

99.9999603760%

2,523,720

178
99.9999900166%

10,016,587

99.9999455198%

1,835,530

177
99.9999857417%

7,013,455

99.9999253755%

1,340,043

176
99.9999797237%

4,931,877

99.9998981672%

982,001

175
99.9999712895%

3,483,046

99.9998615605%

722,337

174
99.9999595211%

2,470,424

99.9998125011%

533,337

173
99.9999431733%

1,759,737

99.9997470088%

395,271

172
99.9999205647%

1,258,887

99.9996599197%

294,048

171
99.9998894360%

904,454

99.9995445629%

219,569

170
99.9998467663%

652,598

99.9993923584%

164,571

169
99.9997885357%

472,893

99.9991923180%

123,811

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

168
99.9997094213%

344,141

99.9989304314%

93,496

167
99.9996024097%

251,515

99.9985889129%

70,867

166
99.9994583047%

184,606

99.9981452833%

53,917

165
99.9992651083%

136,074

99.9975712563%

41,174

164
99.9990072440%

100,730

99.9968313965%

31,560

163
99.9986645903%

74,883

99.9958815099%

24,281

162
99.9982112841%

55,906

99.9946667250%

18,750

161
99.9976142490%

41,916

99.9931192192%

14,533

160
99.9968313965%

31,560

99.9911555410%

11,307

159
99.9958094411%

23,863

99.9886734737%

8,829

158
99.9944812644%

18,120

99.9855483883%

6,920

157
99.9927627566%

13,817

99.9816290270%

5,443

156
99.9905490555%

10,581

99.9767326626%

4,298

155
99.9877101029%

8,137

99.9706395788%

3,406

154
99.9840854286%

6,284

99.9630868216%

2,709

153
99.9794780761%

4,873

99.9537611786%

2,163

152
99.9736475807%

3,795

99.9422913506%

1,733

151
99.9663019177%

2,968

99.9282392963%

1,394

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

150
99.9570883466%

2,330

99.9110907427%

1,125

149
99.9455830880%

1,838

99.8902448799%

911

148
99.9312797919%

1,455

99.8650032777%

741

147
99.9135767802%

1,157

99.8345580959%

604

146
99.8917630764%

924

99.7979796890%

495

145
99.8650032777%

741

99.7542037453%

407

144
99.8323213712%

596

99.7020181412%

336

143
99.7925836483%

482

99.6400497338%

278

142
99.7444809358%

391

99.5667513617%

231

141
99.6865104294%

319

99.4803893690%

192

140
99.6169574875%

261

99.3790320141%

161

139
99.5338778217%

215

99.2605391688%

135

138
99.4350805958%

177

99.1225537500%

114

137
99.3181130218%

147

98.9624953632%

96

136
99.1802471131%

122

98.7775566587%

82

135
99.0184693146%

102

98.5647029151%

70

134
98.8294737819%

85

98.3206753694%

60

133
98.6096601092%

72

98.0419987942%

51

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

132
98.3551363216%

61

97.7249937964%

44

131
98.0617279292%

52

97.3657942589%

38

130
97.7249937964%

44

96.9603702812%

33

129
97.3402495072%

38

96.5045568849%

29

128
96.9025987934%

32

95.9940886433%

25

127
96.4069734486%

28

95.4246402670%

22

126
95.8481819706%

24

94.7918730337%

19

125
95.2209669590%

21

94.0914867949%

17

124
94.5200710546%

18

93.3192771207%

15

123
93.7403109348%

16

92.4711969715%

13

122
92.8766585983%

14

91.5434221090%

12

121
91.9243288744%

12

90.5324192858%

11

120
90.8788718026%

11

89.4350160914%

9

119
89.7362682436%

10

88.2484711894%

9

118
88.4930268282%

9

86.9705435536%

8

117
87.1462801289%

8

85.5995592220%

7

116
85.6938777630%

7

84.1344740241%

6

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

115
84.1344740241%

6.30297414356

82.5749307167%

5.7388581000

114
82.4676075848%

5.70372814115

80.9213089868%

5.2414497373

113
80.6937708458%

5.17967538878

79.1747668425%

4.8018670064

112
78.8144666062%

4.72020213705

77.3372720270%

4.4125314534

111
76.8322499196%

4.31634490415

75.4116222443%

4.0669620824

110
74.7507532660%

3.96051419092

73.4014531849%

3.7596038872

109
72.5746935061%

3.64626736341

71.3112335745%

3.4856849025

108
70.3098594977%

3.36812148102

69.1462467364%

3.2410967685

107
67.9630797074%

3.12139865776

66.9125584538%

3.0222947235

106
65.5421696587%

2.90209798497

64.6169712244%

2.8262136810

105
63.0558595794%

2.70678919205

62.2669653200%

2.6501976543

104
60.5137031432%

2.53252414027

59.8706273779%

2.4919402788

103
57.9259687167%

2.37676298063

57.4365675495%

2.3494345790

102
55.3035150084%

2.23731239758

54.9738265155%

2.2209304558

101
52.6576534466%

2.11227383685

52.4917739192%

2.1048986302

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

100
49.9999999782%

1.99999999913

49.9999999782%

1.9999999991

99
47.3423465534%

1.89905917668

47.5082260808%

1.9050604034

98
44.6964849916%

1.80820333002

45.0261734845%

1.8190474693

97
42.0740312833%

1.72634143572

42.5634324505%

1.7410511155

96
39.4862968568%

1.65251826951

40.1293726221%

1.6702681161

95
36.9441404206%

1.58589543727

37.7330346800%

1.6059880144

94
34.4578303413%

1.52573527121

35.3830287756%

1.5475810473

93
32.0369202926%

1.47138711828

33.0874415462%

1.4944877660

92
29.6901405023%

1.42227563409

30.8537532636%

1.4462100941

91
27.4253064939%

1.37789076562

28.6887664255%

1.4023036061

90
25.2492467340%

1.33777916116

26.5985468151%

1.3623708477

89
23.1677500804%

1.30153679093

24.5883777557%

1.3260555472

88
21.1855333938%

1.26880259813

22.6627279730%

1.2930375921

87
19.3062291542%

1.23925302972

20.8252331575%

1.2630286642

86
17.5323924152%

1.21259732068

19.0786910132%

1.2357684429

85
15.8655259759%

1.18857342558

17.4250692833%

1.2110213007

84
14.3061222370%

1.16694450771

15.8655259759%

1.1885734256

83
12.8537198711%

1.14749590978

14.4004407780%

1.1682303146

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

82
11.5069731718%

1.13003254137

13.0294564464%

1.1498145914

81
10.2637317564%

1.11437662784

11.7515288106%

1.1331641064

80
9.1211281974%

1.10036577278

10.5649839086%

1.1181302847

79
8.0756711256%

1.08785129274

9.4675807142%

1.1045766896

78
7.1233414017%

1.07669678808

8.4565778910%

1.0923777776

77
6.2596890652%

1.06677691809

7.5288030285%

1.0814178174

76
5.4799289454%

1.05797635237

6.6807228793%

1.0715899553

75
4.7790330410%

1.05018887325

5.9085132051%

1.0627954070

74
4.1518180294%

1.04331660699

5.2081269663%

1.0549427583

73
3.5930265514%

1.03726936365

4.5753597330%

1.0479473616

72
3.0974012066%

1.03196406748

4.0059113567%

1.0417308129

71
2.6597504928%

1.02732426212

3.4954431151%

1.0362204981

70
2.2750062036%

1.02327967611

3.0396297188%

1.0313491967

69
1.9382720708%

1.01976583639

2.6342057411%

1.0270547348

68
1.6448636784%

1.01672371917

2.2750062036%

1.0232796761

67
1.3903398908%

1.01409942889

1.9580012058%

1.0199710454

66
1.1705262181%

1.01184389811

1.6793246306%

1.0170800762

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

65
0.9815306854%

1.00991260208

1.4352970849%

1.0145619785

64
0.8197528869%

1.00826528377

1.2224433413%

1.0123757196

63
0.6818869782%

1.006865686

1.0375046368%

1.0104838164

62
0.5649194042%

1.00568128874

0.8774462500%

1.0088521352

61
0.4661221783%

1.00468305052

0.7394608312%

1.0074496959

60
0.3830425125%

1.0038451537

0.6209679859%

1.0062484809

59
0.3134895706%

1.00314475418

0.5196106310%

1.0052232469

58
0.2555190642%

1.00256173637

0.4332486383%

1.0043513385

57
0.2074163517%

1.00207847461

0.3599502662%

1.0036125059

56
0.1676786288%

1.00167960262

0.2979818588%

1.0029887244

55
0.1349967223%

1.0013517921

0.2457962547%

1.0024640190

54
0.1082369236%

1.00108354203

0.2020203110%

1.0020242926

53
0.0864232198%

1.00086497974

0.1654419041%

1.0016571607

52
0.0687202081%

1.00068767465

0.1349967223%

1.0013517921

51
0.0544169120%

1.0005444654

0.1097551201%

1.0010987571

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

50
0.0429116534%

1.00042930075

0.0889092573%

1.0008898838

49
0.0336980823%

1.00033709442

0.0717607037%

1.0007181224

48
0.0263524193%

1.00026359366

0.0577086494%

1.0005774197

47
0.0205219239%

1.00020526136

0.0462388214%

1.0004626021

46
0.0159145714%

1.00015917105

0.0369131784%

1.0003692681

45
0.0122898971%

1.00012291408

0.0293604212%

1.0002936904

44
0.0094509445%

1.00009451838

0.0232673374%

1.0002327275

43
0.0072372434%

1.00007237767

0.0183709730%

1.0001837435

42
0.0055187356%

1.0000551904

0.0144516117%

1.0001445370

41
0.0041905589%

1.00004190735

0.0113265263%

1.0001132781

40
0.0031686035%

1.00003168704

0.0088444590%

1.0000884524

39
0.0023857510%

1.00002385808

0.0068807808%

1.0000688125

38
0.0017887159%

1.00001788748

0.0053332750%

1.0000533356

37
0.0013354097%

1.00001335428

0.0041184901%

1.0000411866

36
0.0009927560%

1.00000992766

0.0031686035%

1.0000316870

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

35
0.0007348917%

1.00000734897

0.0024287437%

1.0000242880

34
0.0005416953%

1.00000541698

0.0018547167%

1.0000185475

33
0.0003975903%

1.00000397592

0.0014110871%

1.0000141111

32
0.0002905787%

1.0000029058

0.0010695686%

1.0000106958

31
0.0002114643%

1.00000211465

0.0008076820%

1.0000080769

30
0.0001532337%

1.00000153234

0.0006076416%

1.0000060765

29
0.0001105640%

1.00000110564

0.0004554371%

1.0000045544

28
0.0000794353%

1.00000079435

0.0003400803%

1.0000034008

27
0.0000568267%

1.00000056827

0.0002529912%

1.0000025299

26
0.0000404789%

1.00000040479

0.0001874989%

1.0000018750

25
0.0000287105%

1.00000028711

0.0001384395%

1.0000013844

24
0.0000202763%

1.00000020276

0.0001018328%

1.0000010183

23
0.0000142583%

1.00000014258

0.0000746245%

1.0000007462

22
0.0000099834%

1.00000009983

0.0000544802%

1.0000005448

21
0.0000069602%

1.0000000696

0.0000396240%

1.0000003962

20
0.0000048317%

1.00000004832

0.0000287105%

1.0000002871

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

19
0.0000033396%

1.0000000334

0.0000207245%

1.0000002072

18
0.0000022984%

1.00000002298

0.0000149034%

1.0000001490

17
0.0000015750%

1.00000001575

0.0000106769%

1.0000001068

16
0.0000010746%

1.00000001075

0.0000076201%

1.0000000762

15
0.0000007301%

1.0000000073

0.0000054180%

1.0000000542

14
0.0000004938%

1.00000000494

0.0000038376%

1.0000000384

13
0.0000003326%

1.00000000333

0.0000027080%

1.0000000271

12
0.0000002230%

1.00000000223

0.0000019036%

1.0000000190

11
0.0000001489%

1.00000000149

0.0000013331%

1.0000000133

10
0.0000000990%

1.00000000099

0.0000009301%

1.0000000093

9
0.0000000655%

1.00000000066

0.0000006464%

1.0000000065

8
0.0000000432%

1.00000000043

0.0000004476%

1.0000000045

7
0.0000000283%

1.00000000028

0.0000003087%

1.0000000031

6
0.0000000185%

1.00000000019

0.0000002121%

1.0000000021

IQ
15 SD Percentile

Rarity: 1/X

16 SD Percentile

Rarity: 1/X

5
0.0000000120%

1.00000000012

0.0000001452%

1.0000000015

4
0.0000000078%

1.00000000008

0.0000000990%

1.0000000010

3
0.0000000050%

1.00000000005

0.0000000673%

1.0000000007

2
0.0000000032%

1.00000000003

0.0000000455%

1.0000000005

1
0.0000000021%

1.00000000002

0.0000000307%

1.0000000003


Normen: decielen, stanine en normklassen


deciel Z-decielgrens 7 normklasse
1 -1,280 zeer laag
2 -0,840 laag
3 -0,525 beneden gemiddeld
4 -0,255 gemiddeld
5 0,000 gemiddeld
6 0,255 gemiddeld
7 0,525 gemiddeld
8 0,840 boven gemiddeld
9 1,280 hoog
10 >1,280 zeer hoog

De waarden van de decielgrenzen worden dus per normtabel op basis van het gemiddelde en de standaarddeviatie berekend en in het lijstbestand opgenomen. Het berekenen van de decielgrenzen heeft als belangrijkste beperking dat er geen rekening gehouden wordt met de scheefheid van de verdeling.

Bij de stanine (afkorting van "standard nine") worden de scores van de normgroep in negen klassen verdeeld. Dit gebeurt zodanig dat de stanine nagenoeg een standaardverdeling heeft met een gemiddelde van 5 en een standaarddeviatie van 2. Onderstaande tabel geeft de grootte van de stanineklassen en de vertaalslag naar gangbare normklassen (zie 4.)

Stanine klassengrootte 5 normklassen 7 normklassen
1 4% zeer laag zeer laag
2 7% laag laag
3 12% laag beneden gemiddeld
4 17% gemiddeld gemiddeld
5 20% gemiddeld gemiddeld
6 17% gemiddeld gemiddeld
7 12% hoog boven gemiddeld
8 7% hoog hoog
9 4% zeer hoog zeer hoog
Voorbeeld van lijsten   Neo

Guiford's C-schaal (1965) is een uitbreiding van de stanine schaal die gevoeliger is aan de uiteinden van de schaal.

Enkele kenmerken van de C-schaal
C-schaalsscore percentiel grenzen % in interval com % percentiel midden waarde betekenis 7 normklasse
10 99-100 1 100 99 extreem hoog zeer hoog
9 97-98 3 99 97 zeer hoog zeer hoog
8 90-96 7 96 93 hoog hoog
7 78-89 12 89 82 boven gemiddeld boven gemiddeld
6 61-77 17 77 68 hoog gemiddeld gemiddeld
5 41-60 20 60 50 gemiddeld gemiddeld
4 24-40 17 40 32 laag gemiddeld gemiddeld
3 12-23 12 23 18 onder gemiddeld onder gemiddeld
2 05-11 7 11 7 laag laag
1 02-04 3 3 3 zeer laag zeer laag
0 0-1 1 1 1 extreem laag zeer laag

De Tscore is een normscore met gemiddelde 50 en sd 10. Voor interpretatie worden de grensen gehanteerd van gem.+/-1*sd, gem+/-2*sd en gem.+/-3*sd

T-score in 7 klassen
T-score bovengrens betekenis 7 normklasse
hoger 80 hoger gem.+3*sd zeer hoog
80 gem.+2*sd hoog
70 gem.+1*sd boven gemiddeld
60 gem. gemiddeld
40 gem.-1*sd onder gemiddeld
30 gem.-2*sd laag
kleiner 30 kleiner gem.-3*sd zeer laag

De meeste handleidingen van vragenlijsten bevatten normgegevens die de score terug leiden tot 7 of 5 uitspraken. De onderstaande tabel geeft een gebruikelijke indeling voor 5 en 7 normklassen.

7 normklassen   5 normklassen
Klasse Bovengrens Klassen Bovengrens
zeer laag 5e percentiel zeer laag 5e percentiel
laag 2e deciel laag 2e deciel
beneden gemiddeld gemiddelde - een standaardmeetfout gemiddeld 8e deciel
gemiddeld gemiddelde + een standaardmeetfout hoog 95e percentiel
boven gemiddeld 8e deciel zeer hoog maximale score
hoog 95e deciel
zeer hoog maximale score
Voorbeelden van lijsten NPV,NMV, SCL90   UCL