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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
A Polytomous Nonlinear Mixed Model for Item Analysis

A Polytomous Nonlinear Mixed Model for Item Analysis

Shin, Seon-Hi

Paperback

General Education

ISBN10: 3639184319
ISBN13: 9783639184310
Publisher: Blues Kids Of Amer
Published: Aug 6 2009
Pages: 112
Weight: 0.39
Height: 0.27 Width: 6.00 Depth: 9.00
Language: English
The study presented the formulation of an IRT model for polytomously scored Likert-type data under the framework of the nonlinear mixed model. The formulated polytomous nonlinear mixed model (PNLMM) was demonstrated to be equivalent to Muraki's rating scale model (1990). Due to the flexibility of the framework, the PNLMM was easily extended into a model for differential item functioning analysis and a regression-type model with a person-level covariate. Using simulations, the accuracy of SAS PROC NLMIXED in estimating the latent trait and the item parameters for the PNLMM was examined through eight common indicators. The correlations between PROC NLMIXED and PARSCALE estimates for model parameters were also evaluated. The results and their educational importance were discussed.

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