public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append("Collected Statistics");
		sb.append(System.lineSeparator());
		sb.append("--------------------");
		sb.append(System.lineSeparator());
		sb.append(System.lineSeparator());
		sb.append(String.format("Number of instances: %d", instances));
		sb.append(System.lineSeparator());
		sb.append(String.format("Mean: %2f", mean));
		sb.append(System.lineSeparator());
		sb.append(String.format("Number of observations: %d", numObs));
		sb.append(System.lineSeparator());
		sb.append("Histogram");
		sb.append(System.lineSeparator());
		for (int i = 0; i < numBuckets; i++) {
			sb.append(String.format(" %3d    %d", i+1, buckets[i]));
			sb.append(System.lineSeparator());
		}
		sb.append(System.lineSeparator());
		return sb.toString();
	}