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Accuracy Of Rasch Model Item Parameter Estimation, Luc Le, Ray Adams
Accuracy Of Rasch Model Item Parameter Estimation, Luc Le, Ray Adams
Dr Luc Tu Le
This study used Monte Carlo simulations to evaluate the item parameter recovery from ACER ConQuest 3 software (Adams, Wu, & Wilson, 2012) for the dichotomous Rasch model. The authors’ primary focus was the comparison of its estimation methods, joint maximum likelihood (JML), marginal maximum likelihood (MML) with a normal distribution assumption and MML with a discrete distributions assumption when the populations were in fact non-normal. The simulation data sets were generated with two test lengths (10 and 50 items) and four alternative true population distributions for the abilities: normal, bimodal, uniform, and chi-square. As expected, results showed that MML-Normal was …
The Abcs Of Gfe, Brandon Youker
The Abcs Of Gfe, Brandon Youker
Brandon W. Youker Ph.D
Goal-free evaluation (GFE) is the process of determining something’s merit intentionally without reference to its stated goals and objectives. The following PowerPoint presentation describes GFE and discusses preliminary attempts at operationalization. The video concludes with a lively discussion where audience members challenge Dr. Youker on GFE's feasibility and merit. . *This presentation is available at The Evaluation Center's website archived as an Evaluation Café presentation: http://www.wmich.edu/evalctr/2012/11/goal-free-evaluation-an-analog-experiment-comparing-goal-free-evaluation-and-goal-based-evalation-utility/