Java stddev stddev(long[] samples)

Description

stddev

License

Apache License

Declaration

public static double stddev(long[] samples) 

Method Source Code

//package com.java2s;
/**/*from   w w w  .  ja  v a  2  s . c o m*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    public static double stddev(long[] samples) {
        double avg = average(samples);

        double result = 0;
        for (long sample : samples) {
            result += (sample - avg) * (sample - avg);
        }

        result /= samples.length;

        return Math.sqrt(result);
    }

    public static double average(long[] samples) {
        return sum(samples) / (samples.length * 1d);
    }

    public static double sum(long[] samples) {
        double result = 0;

        for (long sample : samples) {
            result += sample;
        }

        return result;
    }
}

Related

1. stddev(final double[] in, final int start, final int length)
2. stddev(final int[] scores)
3. stddev(float[] data)
4. stddev(int[] values, int start, int length)
5. stdDev(Integer[] values)
6. stddev(Number[] array, boolean isSample)
7. stdDev(T[] array)
8. stdDeviation(int[] data)
9. stdev(Collection values)