WtoL_multi.tree: Wide-to-long, multiple trees

In irtrees: Estimation of Tree-Based Item Response Models

Description

Recode a wide format data frame to a long format IRTRees data frame in the case when items may have different tree structures

Usage

WtoL_multi.tree(
  data,
  cmx_list,
  id.col,
  resp.col_list,
  covar.col = NULL,
  time.col = NULL
)

Arguments

data	a wide-format (person-by-item) data set
cmx_list	a list including all tree structures
id.col	the ID column
resp.col_list	a list of vectors, with a length matching the length of cmx_list; each element of such a vector points to an item (response variable) using the corresponding mapping matrix
covar.col	columns containing covariates
time.col	the time column when there are repeated (longitudinal) data

Details

Many examples of mapping matrices are given in the vignette. Columns may be specified by numeric index or by name. Response categories must be coded with consecutive integers starting from 1, not 0. Missing data should be properly represented as NA.

irtrees documentation built on Dec. 15, 2021, 1:08 a.m.