# DIF and DDF Detection by Non-Linear Regression Models

## Documentation for package ‘difNLR’ version 1.5.2-2

- DESCRIPTION file.
- Package NEWS.

## Help Pages

difNLR-package | DIF and DDF Detection by Non-Linear Regression Models.
AIC.ddfMLR | Log-likelihood and information criteria for an object of '"ddfMLR"' class.
AIC.difNLR | Log-likelihood and information criteria for an object of the '"difNLR"' class.
AIC.difORD | Log-likelihood and information criteria for an object of '"difORD"' class.
BIC.ddfMLR | Log-likelihood and information criteria for an object of '"ddfMLR"' class.
BIC.difNLR | Log-likelihood and information criteria for an object of the '"difNLR"' class.
BIC.difORD | Log-likelihood and information criteria for an object of '"difORD"' class.
coef.ddfMLR | Extract model coefficients from an object of '"ddfMLR"' class.
coef.difNLR | Extract item parameter estimates from an object of the '"difNLR"' class.
coef.difORD | Extract model coefficients from an object of '"difORD"' class.
coef.estimNLR | Non-linear regression DIF models estimation.
coefficients.ddfMLR | Extract model coefficients from an object of '"ddfMLR"' class.
coefficients.difNLR | Extract item parameter estimates from an object of the '"difNLR"' class.
coefficients.difORD | Extract model coefficients from an object of '"difORD"' class.
ddfMLR | DDF detection for nominal data.
difNLR | DIF detection using non-linear regression method.
difORD | DIF detection among ordinal data.
estimNLR | Non-linear regression DIF models estimation.
fitted.difNLR | Fitted values and residuals for an object of the '"difNLR"' class.
fitted.estimNLR | Non-linear regression DIF models estimation.
formulaNLR | Creates a formula for non-linear regression DIF models.
genNLR | Generates data set based on generalized logistic regression DIF and DDF models.
GMAT | Dichotomous 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.
GMATkey | Key of correct answers for 'GMATtest' dataset.
GMATtest | Dataset based on GMAT with the same total score distribution for groups.
logLik.ddfMLR | Log-likelihood and information criteria for an object of '"ddfMLR"' class.
logLik.difNLR | Log-likelihood and information criteria for an object of the '"difNLR"' class.
logLik.difORD | Log-likelihood and information criteria for an object of '"difORD"' class.
logLik.estimNLR | Non-linear regression DIF models estimation.
MLR | DDF likelihood ratio statistics based on multinomial log-linear regression model.
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.
NLR | DIF statistics for non-linear regression models.
ORD | DIF likelihood ratio statistics for ordinal data.
plot.ddfMLR | ICC plots for an object of '"ddfMLR"' class.
plot.difNLR | ICC and test statistics plots for an object of the '"difNLR"' class.
plot.difORD | ICC plots for an object of '"difORD"' class.
predict.ddfMLR | Predicted values for an object of '"ddfMLR"' class.
predict.difNLR | Predicted values for an object of the '"difNLR"' class.
predict.difORD | Predicted values for an object of '"difORD"' class.
print.estimNLR | Non-linear regression DIF models estimation.
resid.difNLR | Fitted values and residuals for an object of the '"difNLR"' class.
residuals.difNLR | Fitted values and residuals for an object of the '"difNLR"' class.
residuals.estimNLR | Non-linear regression DIF models estimation.
startNLR | Calculates starting values for non-linear regression DIF models.
vcov.estimNLR | Non-linear regression DIF models estimation.