C45ModelSelection.java

...

  // Find "best" attribute to split on.
  minResult = 0;
  for (i=0;i<data.numAttributes();i++){
if ((i != (data).classIndex()) &&
    (currentModel[i].checkModel()))

  // Use 1E-3 here to get a closer approximation to the original
  // implementation.
  if ((currentModel[i].infoGain() >= (averageInfoGain-1E-3)) &&
      Utils.gr(currentModel[i].gainRatio(),minResult)){
    bestModel = currentModel[i];
    minResult = currentModel[i].gainRatio();
  }
  }