LtoL_multi.tree: Long-to-long, multiple trees
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 may have different tree structures

LtoL_multi.tree(
  data,
  cmx_list,
  item_list,
  id.col,
  item.col,
  resp.col,
  covar.col = NULL,
  time.col = NULL
)

`data`	a long-format (person-item-response) data set
`cmx_list`	a list including all tree structures
`item_list`	a list of vectors, with a length matching the length of `cmx_list`; each element of such a vector points to an item ID in `item.col` using the corresponding 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.