title: setting values for ntree and mtry for random forest regression model
body: <p>I'm using R package <code>randomForest</code> to do a regression on some biological data. My training data size is <code>38772 X 201</code>.</p>
  
  <p>I just wondered---what would be a good value for the number of trees <code>ntree</code> and the number of variable per level <code>mtry</code>? Is there an approximate formula to find such parameter values?</p>
  
  <p>Each row in my input data is a 200 character representing the amino acid sequence, and I want to build a regression model to use such sequence in order to predict the distances between the proteins.   </p>