LtoW_multi.tree: Long-to-wide, multiple trees

In irtrees: Estimation of Tree-Based Item Response Models

Description

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

Usage

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

Arguments

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

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.