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From kalpa rajadurai <arka...@gmail.com>
Subject Re: NormalDistribution
Date Sat, 20 Feb 2010 12:20:01 GMT
Sam,

Thanks for info :)

Regards
kalpa
On Sat, Feb 20, 2010 at 5:35 PM, Sam Crawford <samcrawford@gmail.com> wrote:

> Kalpa,
>
> I think you have the wrong mailing list... unless HttpClient is
> branching out into whole new areas!
>
> I suspect you want to head back to http://commons.apache.org/math/ and
> find the mailing lists for that under the Project Information section.
>
> Thanks,
>
> Sam
>
>
> On 20 February 2010 11:48, kalpa rajadurai <arkalpa@gmail.com> wrote:
> > Hi Team,
> >
> > We are working on a small project in designing a web based statistical
> > calculator, supporting certain distribution functions.
> >
> > we used  method *cummulativeProbability(double x)* of *class
> > NormalDistributionImpl* for implementing Normal distribution function.
> >
> > We tried to cross check Apache API's result with that of OpenOffice Calc
> and
> > Excel's result. In most of the cases, the results matched with each
> other.
> > But in certain rare cases, the cumulativeProbability() method returned by
> > slightly different result when compared to the result returned by
> NORMDIST()
> > function of openoffice calc and Excel.
> >
> > Here goes the illustration of the case where we found the mismatch in
> > results:
> >
> > *Using Apache's API:*
> > NormalDistribution normDist = new NormalDistributionImpl(40,1.5);
> > try{
> > System.out.println("cummulative probability::
> > "+normDist.cumulativeProbability(0.908789));
> > }
> > catch(MathException e){
> > e.printStackTrace();
> > }
> >
> > *Result:*
> > cummulative probability:: *-8.104628079763643E-15*
> >
> > *Using openoffice calc:*
> > Same input values given in openoffice calc using the formula:
> > *=NORMDIST(0.908789;40;1.5;1)*
> >
> > *Result:*
> > *0.0*
> >
> > *Using Microsoft Excel:*
> > Same input values given in excel using the formula:
> > *=NORMDIST(0.908789;40;1.5;1)*
> >
> > *Result:*
> > *5.0738E-150*
> >
> > *Different results:*
> > Apache  -8.104628079763643E-15
> > Openoffice 0.0
> > Excel 5.0738E-150
> >
> > We wish to know the following things,
> > 1.) What is the reason for this variation in results?
> > 2.) Which result is more accurate?
> > 3.) Is there any possibility to get the same results as Open Office or
> Excel
> > for this case, using Apache's API?
> >
> > Hope to receive reply from your team at the earliest as possible.
> > Thanks in Advance
> >
> > --
> > Karpaga R
> >
> > "Did you always know that?"
> > "No, I didn't. But I believed"
> >  ---Matrix III
> >
>
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>


-- 
Karpaga R

"Did you always know that?"
"No, I didn't. But I believed"
 ---Matrix III

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