where is lrtest where is lrtest function in r? is lrtest() included why is lrtest not available in r cran.r compiler cannot find function lrtest what lrtest function what is lrtest used for is lrtest available in r function lrtest lrtest function not available is lrtest function in r what functions are not available in lmtest is lmtest a language is lrtest function in r? why is lrtest function not available lrtest function what lrtest function are available in r why is lrtest not available in r what lrtest function is not there what is the error in lrtest