Authors
Li Cai, Albert Maydeu‐Olivares, Donna L Coffman, David Thissen
Publication date
2006/5
Journal
British Journal of Mathematical and Statistical Psychology
Volume
59
Issue
1
Pages
173-194
Publisher
Blackwell Publishing Ltd
Description
Bartholomew and Leung proposed a limited‐information goodness‐of‐fit test statistic (Y) for models fitted to sparse 2P contingency tables. The null distribution of Y was approximated using a chi‐squared distribution by matching moments. The moments were derived under the assumption that the model parameters were known in advance and it was conjectured that the approximation would also be appropriate when the parameters were to be estimated. Using maximum likelihood estimation of the two‐parameter logistic item response theory model, we show that the effect of parameter estimation on the distribution of Y is too large to be ignored. Consequently, we derive the asymptotic moments of Y for maximum likelihood estimation. We show using a simulation study that when the null distribution of Y is approximated using moments that take into account the effect of estimation, Y becomes a very useful statistic to …
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Scholar articles
L Cai, A Maydeu‐Olivares, DL Coffman, D Thissen - British Journal of Mathematical and Statistical …, 2006