# Collection of Methods to Detect Dichotomous, Polytomous, and Continuous Differential Item Functioning (DIF)

## Documentation for package ‘difR’ version 6.1.0

- DESCRIPTION file.
- Package NEWS.

## Help Pages

difR-package | Collection of methods to detect dichotomous, polytomous, and continuous differential item functioning (DIF) in psychometrics
breslowDay | Breslow-Day DIF statistic
Continuous | Detection of DIF for continuous item scores using linear regression
contrastMatrix | Contrast matrix for computing generalized Lord's chi-squared DIF statistic
dichoDif | Comparison of DIF detection methods
difBD | Breslow-Day DIF method
difContinuous | Detection of DIF for continuous items via linear regression
difGenLogistic | Generalized logistic regression DIF method
difGenLord | Generalized Lord's chi-squared DIF method
difGMH | Generalized Mantel-Haenszel DIF method
difLogistic | Logistic regression DIF method
difLogReg | General logistic regression DIF method
difLord | Lord's chi-squared DIF method
difLRT | Likelihood-Ratio Test DIF method
difMantel.poly | Mantel Differential Item Functioning Detection for Polytomous Items
difMH | Mantel-Haenszel DIF method
difPolyLogistic | Logistic regression DIF statistics for polytomous (ordinal) items
difQuade | Detection of Differential Item Functioning Using Quade-Type Association Indices for Polytomous (Ordinal) Item
difR | Collection of methods to detect dichotomous, polytomous, and continuous differential item functioning (DIF) in psychometrics
difRaju | Raju's area DIF method
difSIBTEST | SIBTEST and Crossing-SIBTEST DIF method
difStd | Standardization DIF method
difTID | Transformed Item Difficulties (TID) DIF method
genDichoDif | Comparison of DIF detection methods among multiple groups
genLogistik | Generalized logistic regression DIF statistic
genLordChi2 | Generalized Lord's chi-squared DIF statistic
genMantelHaenszel | Generalized Mantel-Haenszel DIF statistic
ILHTEdif | Detect DIF via the IL-HTE mixed model
itemPar1PL | Item parameter estimation for DIF detection using Rasch (1PL) model
itemPar2PL | Item parameter estimation for DIF detection using 2PL model
itemPar3PL | Item parameter estimation for DIF detection using 3PL model
itemPar3PLconst | Item parameter estimation for DIF detection using constrained 3PL model
itemParEst | Item parameter estimation for DIF detection
itemRescale | Rescaling item parameters by equal means anchoring
LassoData | Rearrange the data matrix for the Detection of DIF using the Lasso Approach (Magis et al. (2015)
lassoDIF.ABWIC | Detection of Differential Item Functioning Using the Lasso Approach: Selection of Optimal lambda Value
lassoDIF.CV | Detection of Differential Item Functioning Using the Lasso Approach: Selection of Optimal lambda via Cross-Validation
liu_agresti_ccor | Liu-Agresti Common Cumulative Odds Ratio
LogistikPoly | Detection of DIF in polytomous (ordinal) items using cumulative logistic regression
LordChi2 | Lord's chi-square DIF statistic
LRT | Likelihood-Ratio Test DIF statistic
mantelHaenszel | Mantel-Haenszel DIF statistic
plot.BD | Breslow-Day DIF method
plot.difQuade | Detection of Differential Item Functioning Using Quade-Type Association Indices for Polytomous (Ordinal) Item
plot.genLogistic | Generalized logistic regression DIF method
plot.GenLord | Generalized Lord's chi-squared DIF method
plot.GMH | Generalized Mantel-Haenszel DIF method
plot.Logistic | Logistic regression DIF method
plot.Lord | Lord's chi-squared DIF method
plot.LRT | Likelihood-Ratio Test DIF method
plot.MH | Mantel-Haenszel DIF method
plot.PDIF | Standardization DIF method
plot.Raj | Raju's area DIF method
plot.SIBTEST | SIBTEST and Crossing-SIBTEST DIF method
plot.TID | Transformed Item Difficulties (TID) DIF method
plot_lasso_paths | Plot coefficient paths from LASSO DIF
print.BD | Breslow-Day DIF method
print.dichoDif | Comparison of DIF detection methods
print.difQuade | Detection of Differential Item Functioning Using Quade-Type Association Indices for Polytomous (Ordinal) Item
print.genDichoDif | Comparison of DIF detection methods among multiple groups
print.genLogistic | Generalized logistic regression DIF method
print.GenLord | Generalized Lord's chi-squared DIF method
print.GMH | Generalized Mantel-Haenszel DIF method
print.Logistic | Logistic regression DIF method
print.Lord | Lord's chi-squared DIF method
print.LRT | Likelihood-Ratio Test DIF method
print.MH | Mantel-Haenszel DIF method
print.PDIF | Standardization DIF method
print.Raj | Raju's area DIF method
print.SIBTEST | SIBTEST and Crossing-SIBTEST DIF method
print.subLogistic | Testing for DIF among subgroups with generalized logistic regression
print.TID | Transformed Item Difficulties (TID) DIF method
RajuZ | Raju's area DIF statistic
SCS | Sexual Compulsivity Scale Data Set
selectDif | Selection of one of the DIF detection methods
selectGenDif | Selection of one of the DIF detection methods among multiple groups
sibTest | SIBTEST DIF statistic
SimDichoDif | Generation of DIF for dichotomous items
SimPolyDif | Generation of DIF for polytomous items
stdPDIF | Standardization DIF statistic
subtestLogistic | Testing for DIF among subgroups with generalized logistic regression
verbal | Verbal Aggression Data Set