Stable maximum likelihood estimation (MLE) of item parameters in 3PLM with a modest sample size remains a challenge. The current study presents a mixture-modeling approach to 3PLM based on which a feasible Expectation-Maximization-Maximization (EMM) MLE algorithm is proposed. The simulation study indicates that EMM is comparable to the Bayesian EM in terms of bias and RMSE. EMM also produces sm...

Item response theory (IRT) has become one of the most popular scoring frameworks for measurement data. IRT models are used frequently in computerized adaptive testing, cognitively diagnostic assessment, and test equating. This article reviews two of the most popular software packages for IRT model estimation, BILOG-MG (Zimowski, Muraki, Mislevy, & Bock, 1996) and MULTILOG (Thissen, 1991), which...

DOCUMENT RESUME TM 030 621 Hanson, Bradley A.; Beguin, Anton A. Separate versus Concurrent Estimation of IRT Item Parameters in the Common Item Equating Design. American Coll. Testing Program, Iowa City, IA. ACT-RR-99-8 1999-12-00 36p. ACT Research Report Series, PO Box 168, Iowa City, IA 52243-0168. Reports Evaluative (142) MF01/PCO2 Plus Postage. *Equated Scores; Estimation (Mathematics); *It...

This study aims to describe the Physics test item parameters in Work and Energy students’ abilities using response theory approach (IRT) dichotomous scoring. research is quantitative descriptive. The subjects were 1175 high school class XI students West Java Banten provinces consisting of 450 male 725 female students. instrument used was as many 25 items multiple choices with Student data scori...

Image enhancement is an important tool for processing image. There exits many enhancement algorithms, in which Retinex algorithm enhance details of an image and is widely used. Retinex algorithm can remove illumination but cannot maintain the range of reflectance, hence it is not essential for non-uniform illumination images. So to preserve naturalness along with enhancing the details we propos...

The standard error of equating is a useful index to quantify the amount of equating error. It is the standard deviation of equated scores over replications of an equating procedure in samples from a population or populations of examines. The current study estimates the SE of item response theory true score equating in the Nonequivalent Groups with Anchor Test design using simulations. Specifica...

The current study aimed to examine differential item functioning (DIF) of a numerical ability test for Gulf state school students. This examined the DIF items by gender and country using two analysis methods; Likelihood Ratio Test (LRT) Mantel-Haenszel (MH). sample size was 2689 individuals throughout grades 5 6, researchers used MH with SPSS LRT BILOG-MG. classification stability coefficient k...

This study aims at identifying the effect of multiple-choice test items' difficulty degree on reliability coefficient and standard error measurement depending item response theory IRT. To achieve objectives study, (WinGen3) software was used to generate IRT parameters (difficulty, discrimination, guessing) for four forms test. Each form consisted (30) items with different coefficients averages ...