WtoW_multi.tree {irtrees}

Wide-to-wide, multiple trees

Description

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

Usage

WtoW_multi.tree(
  data,
  cmx_list,
  id.col = NULL,
  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.