Computations with Rasch Measures
Question: My school is thinking of using the AGS Reading-Level Indicator to measure the progress of our reading program (student growth). We have the W-ability (Rasch) table that accompanies this measure. We would like to know what kind of statistical manipulations would be appropriate to use with these numbers (t-tests, ANOVA, etc.).
Answer: Wonderful! Rasch measures are designed and intended for all those arithmetical and statistical operations which expect their numbers to obey the rules of addition and subtraction, such as the computations of means and standard deviations. In the classification of S. S. Stevens, Rasch measures are "interval".
Computations with Rasch measures, Rasch Measurement Transactions, 2004, 18:3 p. 994
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