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From narjes saraie <narjessar...@gmail.com>
Subject Re: [math]plot distribution
Date Thu, 18 Jun 2015 23:52:47 GMT
Hi Phil.

How  I could   assess goodness of fit in commons math?

thanks for helping me.

cheers.

On Thu, Jun 18, 2015 at 8:06 AM, Phil Steitz <phil.steitz@gmail.com> wrote:

> On 6/18/15 6:31 AM, narjes saraie wrote:
> > Hi All.
> > I am beginner in java and have some data.I want to guess a distribution
> for
> > my data then calculate goodness of fit (gof).
> > I find distribution commons math and use it ,if i want plot my
> distribution
> > or CDF or probability (X>x), how do it?
> > is it any example for distribution and plotting it.
>
> We don't have graphical exploratory data analysis tools in Commons
> Math.  You would do best to start with a package that supports
> generation of histograms if you have no idea what distribution might
> fit the data.  If you do have an idea of what the distribution is,
> depending on what it is, you may be able to estimate the parameters
> of the distribution from the data.  For example, if you think that
> the data are normally distributed, you can use SummaryStatistics in
> the stat package to get the standard statistical estimators of the
> mean and standard deviation, which together determine a normal
> distribution. Then you could do a Kolmogorov-Smirnov test (or group
> the data and use a G- or ChiSquare test) to assess goodness of fit.
> Other distributions have different parameters and different
> statistical estimators.
>
> We don't currently support plotting distributions in Commons Math,
> but the user guide code contains an example showing how to do it
> with some external tools.  Have a look at the plots in the user
> guide section on probability distributions [1] and the source for
> the code that generates those plots [2].
>
> Phil
>
> [1]
> http://commons.apache.org/proper/commons-math/userguide/distribution.html
> [2] http://s.apache.org/HTo
>
> > thanks.
> >
>
>
>
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