Groups > comp.lang.java.programmer > #30257

Re: Regression

Newsgroups	comp.lang.java.programmer
Date	2014-10-30 08:12 -0700
References	<2a713db5-9dbe-4325-9dc5-c781649861ce@googlegroups.com>
Message-ID	<3bfdecda-6d5f-4fcc-9075-3b45adfe4471@googlegroups.com> (permalink)
Subject	Re: Regression
From	FredK <fred.l.kleinschmidt@gmail.com>

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On Monday, October 27, 2014 7:57:58 AM UTC-7, gotts...@gmail.com wrote:
> Cant seem to figure out the correlation portion and the standard deviation portion either. Could use some help. Thank you all very much.
> 	public static double mean(double[] chirp) 
> 	{	 
> 		double sum = 0;
> 		for (int i = 0; i < chirp.length; i++)
> 		{
> 	        sum += chirp[i];
> 	        
> 	    }
> 	    
> 	    return sum / chirp.length;
> 	}
> 	

This is a somewhat naive approach to computing a mean.
Consider what will happen here:

      double[] xx = {Double.MAX_VALUE, 100.0};
      double theMean = mean(xx);

The same problem exists in all of your functions.

-- 
Fred Kleinschmidt

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Regression gottshalk.j@gmail.com - 2014-10-27 07:57 -0700
  Re: Regression Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-10-27 11:17 -0400
  Re: Regression FredK <fred.l.kleinschmidt@gmail.com> - 2014-10-30 08:12 -0700

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