Package index • difNLR

Package overview

difNLR(): DIF detection using non-linear regression method.
difORD(): DIF detection among ordinal data.
ddfMLR(): DDF detection for nominal data.
genNLR(): Generates data set based on generalized logistic regression DIF and DDF models.

startNLR(): Calculates starting values for non-linear regression DIF models.
estimNLR() logLik(<estimNLR>) coef(<estimNLR>) fitted(<estimNLR>) residuals(<estimNLR>) print(<estimNLR>) vcov(<estimNLR>): Non-linear regression DIF models estimation.
formulaNLR(): Creates a formula for non-linear regression DIF models.
MLR(): DDF likelihood ratio statistics based on multinomial log-linear regression model.
NLR(): DIF statistics for non-linear regression models.
ORD(): DIF likelihood ratio statistics for ordinal data.

coef(<difNLR>): Extract item parameter estimates from an object of the "difNLR" class.
logLik(<difNLR>) AIC(<difNLR>) BIC(<difNLR>): Log-likelihood and information criteria for an object of the "difNLR" class.
plot(<difNLR>): ICC and test statistics plots for an object of the "difNLR" class.
predict(<difNLR>): Predicted values for an object of the "difNLR" class.
fitted(<difNLR>) residuals(<difNLR>): Fitted values and residuals for an object of the "difNLR" class.
coef(<difORD>): Extract model coefficients from an object of "difORD" class.
logLik(<difORD>) AIC(<difORD>) BIC(<difORD>): Log-likelihood and information criteria for an object of "difORD" class.
plot(<difORD>): ICC plots for an object of "difORD" class.
predict(<difORD>): Predicted values for an object of "difORD" class.
coef(<ddfMLR>): Extract model coefficients from an object of "ddfMLR" class.
logLik(<ddfMLR>) AIC(<ddfMLR>) BIC(<ddfMLR>): Log-likelihood and information criteria for an object of "ddfMLR" class.
plot(<ddfMLR>): ICC plots for an object of "ddfMLR" class.
predict(<ddfMLR>): Predicted values for an object of "ddfMLR" class.

GMAT: Dichotomous dataset based on GMAT with the same total score distribution for groups.
GMATkey: Key of correct answers for GMATtest dataset.
GMATtest: Dataset based on GMAT with the same total score distribution for groups.
GMAT2: Dichotomous dataset based on GMAT.
GMAT2key: Key of correct answers for GMAT2test dataset.
GMAT2test: Dataset based on GMAT.
MSATB: Dichotomous dataset of Medical School Admission Test in Biology.
MSATBkey: Key of correct answers for MSATBtest dataset.
MSATBtest: Dataset of School Admission Test in Biology.