Generating summary statistics

We can generate summary statistics for data by using the SummaryStatistics class. This is similar to the DescriptiveStatistics class used in the preceding recipe; the major difference is that unlike the DescriptiveStatistics class, the SummaryStatistics class does not store data in memory.

How to do it...

1. Like the preceding recipe, create a method that takes a double array as argument:

           public void getSummaryStats(double[] values){ 
   

2. Create an object of class SummaryStatistics:

           SummaryStatistics stats = new SummaryStatistics(); 
   

3. Add all the values to this object of the SummaryStatistics class:

           for( int i = 0; i < values.length; i++) { 
               stats.addValue(values[i]); 
           } 
   

4. Finally, use methods in the SummaryStatistics class to generate the summary statistics for the values. Close the method when you are done using the statistics:

        double mean = stats.getMean(); 
        double std = stats.getStandardDeviation...