Hi Gilles. I do it and Thank you for your patient guidance.
cheers On Fri, Jun 19, 2015 at 2:51 AM, Gilles <[email protected]> wrote: > Hello. > > On Fri, 19 Jun 2015 01:46:25 -0700, narjes saraie wrote: > >> Hi Gilles, >> >> >> I run this example in Netbeans and struct t distribution >> >> TDistribution t = new TDistribution(29); >> double lowerTail = t.cumulativeProbability(-2.656); // P(T(29) <= >> -2.656) >> double upperTail = 1.0 - t.cumulativeProbability(2.75);// P(T(29) >= 2.75) >> double m = t.density(3); >> out.println( m ); >> >> >> I want to see how I can plot this distribution or >> t.cumulativeProbability(X>x)? >> > > As Phil already told you, there is no plotting utility within Commons Math. > Commons Math is "only" a library of mathematical algorithms. > > In your above case, you could write the values to an ASCII file (and then > use a plotting tool to display them). > In java, this would be a code similar to the following ("import" and > exception > handling omitted): > > ---CUT--- > String filename = "distribution.dat"; > BufferedOutputStream out = new BufferedOutputStream(new > FileOutputStream(filename)); > > TDistribution t = new TDistribution(29); > > final double min = -10; > final double max = 15; > final double delta = 0.01; > for (double x = min; x < max; x += delta) { > final double upperTail = 1 - t.cumulativeProbability(x); > out.println(x + " " + upperTail); > } > > out.close(); > ---CUT--- > > One plotting tool is "gnuplot": > http://gnuplot.sourceforge.net/demo/ > > > HTH, > Gilles > > > >> thanks . >> >> On Thu, Jun 18, 2015 at 7:38 AM, Gilles <[email protected]> >> wrote: >> >> Hi. >>> >>> >>> On Thu, 18 Jun 2015 06:31:00 -0700, 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. >>>> thanks. >>>> >>>> >>> Perhaps it would be clearer to see what you mean with a code example. >>> >>> If you want to plot a distribution implemented in Commons Math, you'd >>> call one the methods defined in the "RealDistribution" interface >>> (e.g. "density(double x)"). >>> >>> But maybe that the functionality which you are looking for is defined >>> in package "org.apache.commons.math3.stat.inference". >>> >>> If you need to fit data to a model (e.g. find the parameters of an >>> assumed distribution), it is perhaps the least-squares fitting which >>> you are looking for. For a univariate function, there is a utility >>> implemented as "org.apache.commons.math3.fitting.SimpleCurveFitter". >>> >>> >>> HTH, >>> Gilles >>> >>> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
