title: Stratified sampling in WEKA
body: <p>How can I split a data set into a training and test set of sizes 75% and 25% of the original data set, respectively using stratified sampling in order to preserve the proportional class sizes in these new sets. I am trying to do this with WEKA.</p>
  
  <p>The "RemovePercentage" filter helps does not do it in a stratified manner, and the "StratifiedRemoveFolds" filter does not do this using percentages.</p>
  
  <p>I would appreciate any help or suggestion.</p>