single construct, the issues of IRT item parameter and proficiency estimates were investigated. The intent of this … dissertation is to determine if different IRT calibration designs result in differences to item and proficiency parameter estimates … conducted based upon the real data.The factors investigated for the real data study included three IRT calibration designs and …

using a testlet model against a standard IRT model are evaluated. The results indicate that under the simulated conditions …

This dissertation compares the parameter estimates obtained from two item response theory (IRT) models: the 1-PL IRT … model and the MC1-PL IRT model. Several scenarios were explored in which both unidimensional and multidimensional item … scenarios, the MC1-PL IRT model showed greater precision in the recovery of the true underlying item difficulty values and …

Response Theory (IRT) methods, followed by an examination of the revised three-point CWEQ II. (1) Background: The psychometric … properties of the CWEQ II have not been previously assessed using more robust techniques such as IRT. (2) Methods: This is a … were analyzed using a polytomous IRT model. (3) Results: The two versions of CWEQ II fit the SE data equally as each had …