BMIRT ToolKit:

BMIRT ToolKit is a suite of software containing BMIRT, LinkMIRT, SimuMIRT, and SimuMCAT. They are free to download for research purpose.To use a software, please fill the corresponding user agreement form and send it to me.

Calibration software: BMIRTII(Yao, 2003, 2010), Bayesian Multivariate item Response Theory, is a computer program that uses Markov chain Monte Carlo (MCMC) Metropolics-Hastings method to produce item and ability parameter estimates and model fit statistics such as AIC, BIC, DIC, in multidimensional, multi-group item response theory model frame work; exploratory and confirmatory mode are supported; it supports three-parameter logistic model, generalized two-parameter partial-credit model, graded response model, higher-order model, testlet model, and rater model.



Linking Software: LinkMIRT(Yao, 2009), Linking Multivariate Item Response Theory, is a computer program that links two sets of item parameters by matching test response function, mean/mean, and mean/sigma in the multidimensional frame work.

Simulation Software: SimuMIRT (Yao, 2003) is a computer program that simulates examinees (ability) and generate responses to a given set of item paramters specified by the user.

CAT Simulation Software: SimuMCAT (Yao, 2011) is a computer program for MCAT simulation, which has five MCAT item seelction procedures (includes Angle, Reckase 2009; Volume, Segall, 1996; Kullback-Leibler information; Minimized the error variance of the composite score with optimized weight, Yao, 2010)  with item exposure control methods (includes extension of Sympson-Hetter, 1985) and the Multidimensional Priority Index for content constraints.