package?com.mingrisoft.math;

import?java.util.Arrays;
import?java.util.Random;

import?org.apache.commons.math.stat.descriptive.DescriptiveStatistics;

public?class?DescriptiveStatisticsTest?{
????public?static?void?main（String[]?args）?{
????????DescriptiveStatistics?ds?=?new?DescriptiveStatistics（10）;
????????for?（int?i?=?0;?i?????????????ds.addValue（new?Random（）.nextInt（10））;//?向數(shù)據(jù)集中添加10個(gè)小于10的隨機(jī)變量
????????}
????????System.out.println（“數(shù)據(jù)集中的全部元素：“）;
????????System.out.println（Arrays.toString（ds.getValues（）））;
????????System.out.println（“數(shù)據(jù)集的算數(shù)平均數(shù)是：“?+?ds.getMean（））;
????????System.out.println（“數(shù)據(jù)集的幾何平均數(shù)是：“?+?ds.getGeometricMean（））;
????????System.out.println（“數(shù)據(jù)集的方差是：“?+?ds.getVariance（））;
????????System.out.println（“數(shù)據(jù)集的標(biāo)準(zhǔn)方差是：“?+?ds.getStandardDeviation（））

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件?????????295??2013-11-18?14:39??.classpath
?????文件?????????379??2010-09-11?17:01??.project
?????文件????????2194??2013-11-21?08:41??bin\com\mingrisoft\math\DescriptiveStatisticsTest.class
?????文件??????832410??2013-11-18?14:39??lib\commons-math-2.1.jar
?????文件????????1346??2010-09-11?17:01??src\com\mingrisoft\math\DescriptiveStatisticsTest.java