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- df = data.frame("Q1" = sample(1:7, 100, replace = T), "Q2" =
- sample(1:5, 100, replace = T))
- library(mirt)
- model = mirt(data = df, model = 1, itemtype = "gpcm")
- coef(model, IRTpars = T)
- plot(model, type = "trace")
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