title: Mixed Effects Models in Spark or other technology
body: <p>Is it possible to run a mixed-effects regression model in Spark? (as we can do with lme4 in R, with MixedModels in Julia or with Statsmodels MixedLM in Python).<br>
  Any example would be great.</p>
  
  <p>I've read there is a GLMix function but I don't know if the user can use it directly to fit a model and get the coefficients and p-values or if it can only be used internally by machine learning libraries.   </p>
  
  <p>I would like to move to Spark because my datasets are much bigger than memory.   </p>
  
  <p>Is there any other common database or framework able to do something like that streaming data from disk?<br>
  I've only seen some able to do simple linear regression.   </p>
  
  <p>Regards</p>