title: Hausman's specification test for "glmer" from lme4
body: <p>I want to make a "Fixed/Random Models for Generalized linear model" (family="binomial"), because I have a data base where observations come from a population and there is a grouping structure. Then I use the function <code>glmer</code> from the <code>lme4</code> package, also I have read that I can use the <code>glmmPQL</code> function from library <code>MASS</code> (Faraway,2006). </p>
  
  <p>My problem arises when I want to justify the use of random versus fixed model using the Hausman's test (Greene,2012), I don't find a specific function that allows me to do this similar to the <code>phtest</code> test featured in the package <code>plm</code>.</p>
  
  <p>How to justify using the random model?</p>