Representing Response-time Information in Item Banks |
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30 items Admission Council LAW best fit central mass Distribution Weibull Distribution Double probability plots Empirical Response-Time entire response-time distribution Expected Cum Prob exploratory and confirmatory exploratory sample fast response fits the observed four distribution functions gamma and Weibull Gamma Distribution Weibull item 18 item 27 Item Number item response Law School Admission lognormal density Lognormal Distribution 0.00 lognormal distribution fits lognormal distribution provided mean squared error median misplaces the central model response normal density Normal Distribution 1.00 normal distribution provides number of fast Observed Cum Prob observed response observed response-time distribution operational items panel of Figure parameter estimates plots for item positively skewed pretest items Prob 25 Prob FIGURE Prob Gamma Distribution Prob Observed probability density function provides the worst root mean squared sample size sample statistics scale parameter School Admission Council Scrams shown standard deviation top right panel unimodal and positively values of RMSE Weibull Distribution 1.00