Reliability of the RSI-P (Grades 1 and 2)
Field testing of the RSI-P was conducted from 1988 through 1991. The first test-retest reliability study was conducted during 1988 with 105 first and second-grade subjects drawn from New York City and its suburbs during a three-week period. Reliability coefficients for the RSI-P subscales ranged from .67 to .89, with the highest reliability coefficients (.77 to .89) obtained for the perceptual subscales. The RSI-P visual and auditory test items are largely performance based. This change from the previous RSI version substantially increased both the reliability and validity of those items for first and second graders.
Similar results were found in a study of 158 first and second graders conducted in 1992, with a population drawn from Kansas, Missouri, New York and Washington. In this study, a three-week retest interval was used. Reliability coefficients for the RSI-P subscales ranged from .69 to .87 with the highest reliability coefficients (.78 to .87) obtained for the perceptual subscales.
Reliability of the RSI-I (Grades 3-8)
A study was conducted in 1992 with 210 students drawn from the states of Kansas, Michigan, New York, Oklahoma and Washington in grades three, five and six. In this study, the reliability coefficients for the RSI subscales ranged from .63 to .87 and averaged .76. The highest reliability coefficients were obtained for sound (.75), design (.74), auditory perception (.71), visual perception (.82), tactile perception (.70) and kinesthetic perception (.77).
Reliability of the RSI-A (Grades 9 through Adult)