private void createSecondActiveCluster(double[] timeVector, String user) {
		double[] post_count = timeVector;
		double totalPost = 0.0;

		for (double i : post_count) {
			totalPost += i;
		}

		double threshHold = (20 * totalPost) / 100;
		double firstClusterSize = post_count[0] + post_count[1] + post_count[2]
				+ post_count[3];
		double secondClusterSize = post_count[4] + post_count[5]
				+ post_count[6] + post_count[7];
		double thirdClusterSize = post_count[8] + post_count[9]
				+ post_count[10] + post_count[11];
		double fourthClusterSize = post_count[12] + post_count[13]
				+ post_count[14] + post_count[15];
		double fifthClusterSize = post_count[16] + post_count[17]
				+ post_count[18] + post_count[19];
		double sixthClusterSize = post_count[20] + post_count[21]
				+ post_count[22] + post_count[23];

		if (firstClusterSize > threshHold) {
			secondActivitycluster0004.add(user);
		}
		if (secondClusterSize > threshHold) {
			secondActivitycluster0408.add(user);
		}
		if (thirdClusterSize > threshHold) {
			secondActivitycluster0812.add(user);
		}
		if (fourthClusterSize > threshHold) {
			secondActivitycluster1216.add(user);
		}
		if (fifthClusterSize > threshHold) {
			secondActivitycluster1620.add(user);
		}
		if (sixthClusterSize > threshHold) {
			secondActivitycluster2000.add(user);
		}

	}