WtoL_single.tree: Wide-to-long, one tree
In irtrees: Estimation of Tree-Based Item Response Models

Recode a wide format data frame to a long format IRTrees data frame in the case when all items have the same tree structure

WtoL_single.tree(
  data,
  cmx,
  id.col,
  resp.col,
  covar.col = NULL,
  time.col = NULL
)

`data`	a wide-format (person-by-item) data set
`cmx`	a a category-by-node mapping matrix
`id.col`	the ID column
`resp.col`	the columns containing the item responses
`covar.col`	columns containing covariates
`time.col`	the time column when there are repeated (longitudinal) data

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.