ERIC Number: EJ720518
Record Type: Journal
Publication Date: 2005-Sep
On the Existence and Uniqueness of JML Estimates for the Partial Credit Model
Psychometrika, v70 n3 p517-531 Sep 2005
A necessary and sufficient condition is given in this paper for the existence and uniqueness of the maximum likelihood (the so-called joint maximum likelihood) estimate of the parameters of the Partial Credit Model. This condition is stated in terms of a structural property of the pattern of the data matrix that can be easily verified on the basis of a simple iterative procedure. The result is proved by using an argument of Haberman (1977).
Descriptors: Item Response Theory, Maximum Likelihood Statistics, Mathematical Models, Psychometrics
Springer, 233 Spring Streeet, New York, NY 10013. Tel: 212-460-1539; Fax: 212-460-1594.
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Authoring Institution: N/A