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man/residif.Rd

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+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/residif.R
+\name{residif}
+\alias{residif}
+\title{RESIDIF procedure for DIF detection as per Andrich and Hagquist (2015)}
+\usage{
+residif(df = NULL, items = NULL, grp = NULL, verbose = T)
+}
+\arguments{
+\item{df}{data.frame containing the data}
+
+\item{items}{vector containing the names of columns where item responses are stored in df}
+
+\item{grp}{vector containing the name of the column where an optional group membership variable is stored in df}
+}
+\value{
+A data.frame containing a column listing the detected DIF item and another listing detected DIF forms
+}
+\description{
+This function detects DIF on PCM items using ANOVA of person-item residuals
+}