inst.instance(i).value(classIndex));
if (!Utils.eq(inst.instance(i + 1).value(attr),
inst.instance(i).value(attr))) {
leftSubset.calculateDerived();
rightSubset.calculateDerived();
leftCorr = Math.abs(leftSubset.correlation);
rightCorr = Math.abs(rightSubset.correlation);
leftVar = (leftSubset.yStats.stdDev * leftSubset.yStats.stdDev);
leftVar = Math.abs(leftVar);