MathTest {bairt} | R Documentation |
Observed data for a math test designed by Simon Bolivar University (USB) in 2012. It is represented by an 100 × 15 matrix of 1’s and 0’s.
data(MathTest)
The i-th row of this matrix represents the answers from the i-th examinee, whereas the elements in j-th column represents the answers from the examinees to the j-th test item.
# data for model data("MathTest") # Only for the first 500 examinees of the data MathTest # Two-Parameter Normal Ogive Model model2 <- mcmc.2pnob(MathTest[1:500,], iter = 400, burning = 100) check.plot(model2) # For all examinees of the data MathTest # Three-Parameter Normal Ogive Model # selection of the prior for 5 response options cprior <- select.c.prior(5) model3 <- mcmc.3pnob(MathTest, iter = 3500, burning = 500, c.prior = cprior) check.plot(model3) irc(model3, item = 11) chain.study(model3, chain = 11, parameter = "a") parameter.plot(model3) ## End(Not run)