WtoL_single.tree {irtrees}

Wide-to-long, one tree

Description

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

Usage

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

Arguments

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

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.