DIF PCM analysis with table output for item locations

Makes use of the eRm package function LRtest(). Outputs a table with item average locations, group differences, and standard errors.

Usage

RIdifTableLR(
  dfin,
  dif.var,
  model = "PCM",
  sort = FALSE,
  fontfamily = "sans-serif",
  cutoff = 0.5
)

Arguments

dfin

Dataframe with item data only

dif.var

DIF variable

model

Defaults to "PCM", optional "RM" under development

sort

Set to TRUE to sort the table based on DIF size

fontfamily

Set table font

cutoff

Cutoff in item location logit difference for table highlighting

Details

DIF variables need to be factors with the same length as the number of rows in the dataset.

sample usage: RIdifTableE(df, dif.age)