This is an internal function used by
irtree_fit_mirt(). It receives its
inputs from the model object and the data set and returns a
Object of class
Data frame containing containing one row per respondent and one
column per variable. The variable names must correspond to those used in
A list with three elements.
mirt_string is the mirt::mirt.model
itemtype can be passed to
lambda is the modified lambda matrix from the
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