Mirt

This module wraps the mirt R module. See mirt on CRAN.

All fit_* functions return a tuple of the form (item_bank, labels) where

• item_bank is a concrete subtype of FittedItemBanks.AbstractItemBank
• labels is a Vector{String} of item labels

If return_raw is set to true, the functions will return a tuple of the form (item_bank, labels, irt_model) where irt_model is the raw R object.

Any keyword arguments passed to the fit_* functions are directly to the mirt function.

fit_2pl(df; return_raw, kwargs...)

Fit a 2PL model to the data in df.

Returns a FittedItemBanks.ItemBank2PL.

fit_3pl(df; return_raw, kwargs...)

Fit a 3PL model to the data in df.

Returns a FittedItemBanks.ItemBank3PL.

fit_4pl(df; return_raw, kwargs...)

Fit a 4PL model to the data in df.

Returns a FittedItemBanks.ItemBank4PL.

fit_gpcm(df; return_raw, kwargs...)

Fit a Generalized Partial Credit Model (GPCM) to the data in df.

Returns a FittedItemBanks.GPCMItemBank.

fit_mirt_2pl(df, dims; return_raw, kwargs...)

Fit a 2PL MIRT model to the data in df.

Returns a FittedItemBanks.ItemBankMirt2PL.

fit_monopoly(df; return_raw, monopoly_k, kwargs...)

Fit a monotonic polynomial IRT model to the data in df.

Returns a FittedItemBanks.MonopolyItemBank.

fit_spline(df; return_raw, spline_args, kwargs...)

Fit a B-spline IRT model to the data in df.

Returns a FittedItemBanks.BSplineItemBank.