Estimating Growth when Content Specifications Change:. A Multidimensional IRT Approach Mark D. Reckase Tianli Li Michigan State University. The Problem. State curriculum frameworks often change from one grade to the next reflecting the addition of new instructional content.
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A Multidimensional IRT Approach
Mark D. Reckase
Michigan State University
Note: The numbers in parentheses are the common items between the two forms of the tests.
Note: Values in parentheses are the observed means from the simulated data
Covariance Matrix for Grade 6
Covariance Matrix for Grade 7
Note: Values in parentheses are estimated from the simulated data.