examples/mllib/JavaHypothesisTestingKolmogorovSmirnovTestExample.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.examples.mllib;
0019
0020 import org.apache.spark.SparkConf;
0021 import org.apache.spark.api.java.JavaSparkContext;
0022 // $example on$
0023 import java.util.Arrays;
0024
0025 import org.apache.spark.api.java.JavaDoubleRDD;
0026 import org.apache.spark.mllib.stat.Statistics;
0027 import org.apache.spark.mllib.stat.test.KolmogorovSmirnovTestResult;
0028 // $example off$
0029
0030 public class JavaHypothesisTestingKolmogorovSmirnovTestExample {
0031   public static void main(String[] args) {
0032
0033     SparkConf conf =
0034       new SparkConf().setAppName("JavaHypothesisTestingKolmogorovSmirnovTestExample");
0035     JavaSparkContext jsc = new JavaSparkContext(conf);
0036
0037     // $example on$
0038     JavaDoubleRDD data = jsc.parallelizeDoubles(Arrays.asList(0.1, 0.15, 0.2, 0.3, 0.25));
0039     KolmogorovSmirnovTestResult testResult =
0040       Statistics.kolmogorovSmirnovTest(data, "norm", 0.0, 1.0);
0041     // summary of the test including the p-value, test statistic, and null hypothesis
0042     // if our p-value indicates significance, we can reject the null hypothesis
0043     System.out.println(testResult);
0044     // $example off$
0045
0046     jsc.stop();
0047   }
0048 }
0049