Appendix A - Wyoming Severe Discrepancy Formula

Current through April 27, 2019
Appendix A - Wyoming Severe Discrepancy Formula

Consistent with 34 C.F.R. § 300.307, a school district or public agency is not required to use the Wyoming Severe Discrepancy Formula in order to find a child eligible for special services under the category of Specific Learning Disability (SLD). In the event a school district or public agency elects to establish a child's eligibility under the category of SLD through use of a severe discrepancy model, the school district or public agency must use the Wyoming Severe Discrepancy Formula and document compliance on the eligibility report.

The assessment of intellectual ability and academic functioning level must include individually administered norm-reference tests that are reliable and valid, and administered by an individual specifically trained to administer and interpret the instruments. Criterion-referenced tests, informal measures, work samples, classroom observations, and the child's educational history may be used as needed to corroborate norm-referenced test scores.

A child whose disability is a Specific Learning Disability must demonstrate a severe discrepancy between current achievement level and expected achievement level of 22 points upon initial evaluation. Expected achievement level (obtained from Table A) is based on the correlation between tests of the child's composite intellectual standard score compared to the child's composite achievement score in one (1) or more core achievement areas.

Instructions:

In all cases, intellectual and achievement standard scores should be based on age norms rather than grade norms and, when available, on cluster scores rather than on subtest scores. Using the most current editions and norms of any chosen standardized tests is preferable to using older editions with outdated norms.

The table on the following page entitled Correlation Coefficient Between Ability and Achievement Test Scores should be used to determine the child's expected achievement level. This table takes into account the correlation between the intellectual and achievement measures being used as well as regression toward the mean. To use this table, the steps outlined below must be followed:

Step 1: Determine the correlation between the intellectual and achievement measures being used, if available. If the correlation between intellectual and achievement measures is not known, .65 may be used as an adequate median correlation between such measures.

Step 2: Locate the child's intellectual standard score in the side columns of Table A, entitled Correlation Coefficient Between Ability and Achievement Test Scores.

step 3: Follow the row determined In Step 2 to the column with the correlation value closest to the correlation between the] chosen measures of intellectual functioning and achievement or to a correlation of ,65 if a specific correlation coefficient Is not known.

Ability Score

Table A: Correlation Coefficient Between Ability and Achievement Test Scores

Ability Score

0.4

0.45

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0,85

0.9

Expected Achievement Score with Correction for Regression Toward the Mean

130

112

114

115

117

118

120

121

123

124

126

127

130

129

112

113

115

116

117

119

120

122

123

125

126

129

128

111

113

114

115

117

118

120

121

122

124

125

128

127

111

112

114

115

116

118

119

120

122

123

124

127

126

110

112

113

114

116

117

118

120

121

122

123

126

125

110

111

113

114

115

116

118

119

120

121

122

125

124

110

111

112

113

114

116

117

118

119

120

122

124

123

109

110

112

113

114

115

116

117

118

120

121

123

122

109

110

111

112

113

114

115

117

118

119

120

122

121

108

109

111

112

113

114

115

116

117

118

119

121

120

108

109

110

111

112

113

114

115

116

117

118

120

119

108

109

110

110

111

112

113

114

114

116

117

119

118

107

108

109

110

111

112

113

114

114

115

116

118

117

107

108

109

109

110

111

112

113

114

114

115

117

116

106

107

108

109

110

110

111

112

113

114

114

116

115

106

107

108

108

109

110

111

111

112

113

114

115

114

106

106

107

108

108

109

110

111

111

112

113

114

113

105

106

107

107

108

108

109

110

110

111

112

113

112

105

105

106

107

107

108

108

109

110

110

111

112

111

104

105

106

106

107

107

108

108

109

109

110

111

110

104

105

105

106

106

106

107

108

108

109

109

110

109

104

104

105

105

105

106

106

107

107

108

108

109

108

103

104

104

104

105

105

106

106

106

107

107

108

107

103

103

104

104

105

105

105

105

106

106

106

107

106

102

103

103

103

104

104

104

105

105

105

105

106

105

102

102

103

103

103

103

104

104

104

104

104

105

104

102

102

102

102

102

103

103

103

103

103

104

104

103

101

101

102

102

102

102

10,2

102

102

103

103

103

102

101

101

101

101

101

101

101

101

102

102

102

102

101

100

100

101

101

101

101

101

101

101

101

101

101

100

100

100

100

100

100

100

100

100

100

100

100

100

99

100

100

100

99

99

99

99

99

99

99

99

99

98

99

99

99

99

99

99

99

99

98

98

98

98

97

99

99

99

98

98

98

98

98

98

97

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96

98

98

98

98

98

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97

97

97

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96

95

98

98

98

97

97

97

97

96

96

96

96

95

94

98

97

97

97

96

96

96

96

95

95

95

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93

97

97

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96

96

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92

97

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94

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91

96

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96

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94

93

93

92

92

91

90

96

96

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94

93

93

92

92

91

90

89

96

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93

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92

92

91

91

90

89

88

95

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93

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92

92

91

90

90

89

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87

95

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92

92

91

90,

90

89

88

87

86

94

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92

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90

90

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83

82

93

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90

89

88

87

87

86

85

84

82

81

92

91

91

90

89

88

87

86

85

84

83

81

80

92

91

90

89

88

87

86

85

84

83

82

80

79

92

91

90

88

87

86

85

84

83

82

81

79

78

91

90

89

88

87

86

85

84

82

81

80

78

77

91

90

89

87

86

85

84

83

82

80

79

77

76

90

89

88

87

86

84

83

82

81

80

78

76

75

90

89

88

86

85

84

83

81

80

79

78

75

74

90

88

87

86

84

83

82

81

79

78

77

74

73

89

88

87

85

84

82

81

80

78

11

76

73

72

89

87

86

85

83

82

80

79

78

76

75

72

71

88

87

86

84

83

81

80

78

77

75

74

71

70

88

86

85

84

82

80

79

78

76

74

73

70