LtoL_single.tree: Long-to-long, single tree
In irtrees: Estimation of Tree-Based Item Response Models

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

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

`data`	a long-format (person-item-response) data set
`cmx`	a a category-by-node mapping matrix
`id.col`	the person ID column
`item.col`	the item ID column
`resp.col`	the response column
`covar.col`	columns containing covariates
`time.col`	the time column. If not NULL, `time.col` should be nested in `id.col`, since it indicates repeated measures within persons

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.