code: protected double estimateQuantile(Bucket bucket, double expectedCount, double lastCount) {
  		return bucket.getMin() + (bucket.getMax() - bucket.getMin()) * Math.exp(Math.log(expectedCount - lastCount) / Math.log(bucket.getCount()));
  	}
docs: {@inheritDoc}
  <p/>
  Used during quantiles computation to do exponential regression over one bucket.