irtree_recode: Recode data into pseudoitems

In ItemResponseTrees: IR-Tree Modeling in 'mirt', 'Mplus', or 'TAM'

Description

This function takes a data set with polytomous items and an irtree_model and returns the recoded items, the so-called pseudoitems.

Usage

irtree_recode(object = NULL, data = NULL, keep = FALSE)

Arguments

object	Object of class irtree_model. See irtree_model for more information.
data	Data frame containing containing one row per respondent and one column per variable. The variable names must correspond to those used in object.
keep	Logical indicating whether to append the original items to the data frame of the generated pseudoitems

Value

Data frame

Examples

m1 <- "
IRT:
t BY x1;
e BY x1;
m BY x1;
Equations:
1 = (1-m)*(1-t)*e
2 = (1-m)*(1-t)*(1-e)
3 = m
4 = (1-m)*t*(1-e)
5 = (1-m)*t*e
Class:
Tree
"
model1 <- irtree_model(m1)
dat <- data.frame(x1 = 1:5)
irtree_recode(model1, dat, keep = TRUE)

ItemResponseTrees documentation built on July 2, 2020, 2:25 a.m.