title: lme4 glmm model convergence issue
body: <p>I am trying to use the lme4 package for a glmm and am getting a convergence code of 0 and a statement: Model failed to converge with max|grad| = 0.00791467 (tol = 0.001, component 1).  I am interested in using the lme4 package because I would like to have AIC values to determine the appropriate model as I add in additional covariates.   </p>
  
  <p>Two weeks ago when I tried the same approach I got a warning message that the model failed to converge because of the max|grad| issue, but am not getting the warning message this time, just the statement at the end of the summary output.  </p>
  
  <p>Does this mean that the model is not converging?  I also used the glmmPQL method.  The coefficient parameter estimates are similar between the two model types.  </p>
  
  <p>Here is glmer (lme4) model code.  I increased the maxfun to deal with other issues I had when I ran the model last time.  </p>
  
  <pre><code>l1&lt;-glmer(Meat_Weight~logsh+SAMS_region_2015+(1|StationID),
          family="Gamma"(link="log"),data=datad,control=glmerControl(optCtrl=list(maxfun=100000)))
  </code></pre>
  
  <p>Here is the glmmPQL code.  </p>
  
  <pre><code>m1&lt;-glmmPQL(fixed=Meat_Weight~logsh+SAMS_region_2015,random=~1|StationID,
          family=Gamma(link="log"),data=datad)
  </code></pre>
  
  <p>I am sure this is not information to diagnosis the problem, but if anyone has suggestions I can provide more data.  </p>
  
  <p>Thanks   </p>