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Rasch Maximum Likelihood Estimation For Theta And W-Scores With Panel Study Of Income Dynamics Woodcock-Johnson Revised Achievement Raw Scores, Ezekiel J. Dixon-Román

Ezekiel J Dixon-Román

This appendix explains the estimation of the Rasch maximum likelihood estimated thetas using the raw scores of the Woodcock-Johnson Revised Achievement Measure in the Panel Study of Income Dynamics. It is then discussed how to estimate the W-scores from the Rasch maximum likelihood estimated thetas. The W-scores ensure stability in score changes that accounts for item difficulty and person ability for growth modeling.