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. > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
