LtoL_multi.tree {irtrees}

Long-to-long, multiple trees

Description

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

Usage

LtoL_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.