title: What does the parameter 'classwt' in RandomForest function in RandomForest package in R stand for?
body: <p>The help page for <code>randomforest::randomforest()</code> says:</p>
  
  <blockquote>
    <p>"classwt - Priors of the classes. Need not add up to one. Ignored for regression."</p>
  </blockquote>
  
  <p>Could setting the <code>classwt</code> parameter help when you have heavy unbalanced data,  ie. priors of classes differs strongly ? </p>
  
  <p>How should I set <code>classwt</code> when training a model on a dataset with 3 classes with a vector of priors equal to (p1,p2,p3), and in test set priors are (q1,q2,q3)?</p>