# pbkrtest v0.4-6

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## Parametric Bootstrap and Kenward Roger Based Methods for Mixed Model Comparison

Test in mixed effects models. Attention is on mixed effects models as implemented in the 'lme4' package. This package implements a parametric bootstrap test and a Kenward Roger modification of F-tests for linear mixed effects models and a parametric bootstrap test for generalized linear mixed models.

## Functions in pbkrtest

 Name Description PBmodcomp Model comparison using parametric bootstrap methods. get_Lb_ddf Adjusted denomintor degress freedom for linear estimate for linear mixed model. pbkrtest-internal Internal functions in the pbkrtest package KenwardRoger Ftest and degrees of freedom based on Kenward-Roger approximation vcovAdj Ajusted covariance matrix for linear mixed models according to Kenward and Roger beets Yield and sugar percentage in sugar beets from a split plot experiment. PBrefdist Calculate reference distribution using parametric bootstrap getKR Extract (or "get") components from a KRmodcomp object. model2restrictionMatrix Conversion between a model object and a restriction matrix budworm Effect of Insecticide on survivial of tobacco budworms No Results!