*/
private void computeStd(int cI) {
List<VectorWritable> repPts = representativePoints.get(cI);
GaussianAccumulator accumulator = new OnlineGaussianAccumulator();
for (VectorWritable vw : repPts) {
accumulator.observe(vw.get(), 1.0);
}
accumulator.compute();
double d = accumulator.getAverageStd();
stDevs.put(cI, d);
}