statistic Rao's score Rao score test regTermTest(model, test.terms, null=NULL,df=Inf, method=c("Wald","LRT")) from: http://r-survey.r-forge.r-project.org/survey/html/regTermTest.html Lagrange multiplier test Rao, JNK, Scott, AJ (1984) "On Chi-squared Tests For Multiway Contingency Tables with Proportions Estimated From Survey Data" Annals of Statistics 12:46-60. Rao-Scott test the Rao-Scott score is a statistic which is used to test the hypothesis that all coefficients associated with a particular regression term are zero (or have some other specified values). the LRT uses a linear combination of chi-squared distributions Philippe Rocca-Serra ready for release