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Fig. 2 | Journal of Neurodevelopmental Disorders

Fig. 2

From: Within-task variability on standardized language tests predicts autism spectrum disorder: a pilot study of the Response Dispersion Index

Fig. 2

Demonstration of Rasch calculation. Individual 1 represents a participant who displays developmental delay and reaches a testing ceiling (depicted with red X’s). Individual 2 represents a participant who displays developmental difference and does not reach a testing ceiling. The overall score is the total number of correct responses (check marks). Weights for each test item are defined as the percentage of typically developing individuals who responded correctly. A sample calculation for determining the probability of a correct response is shown for item 5, and the overall probability of the observed distribution of responses is shown for individuals 1 and 2

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