Hi. Le dim. 1 août 2021 à 18:52, Alex Herbert <alex.d.herb...@gmail.com> a écrit : > > On Sun, 1 Aug 2021 at 15:57, Gilles Sadowski <gillese...@gmail.com> wrote: > > > > > > > Do you think that the API defined in the > > "commons-statistics-distribution" > > module is suitable for implementing this concept: > > https://en.wikipedia.org/wiki/Distribution_(mathematics) > > ? > > > > That is a different definition of distribution
Sure. I thought that you were mentioning it as a possible scope extension. > and involves using > distributions to define differentials of integrable functions. I am not > familiar with this usage. It may have been applicable in the scope of CM > but I think that statistics should be limited in scope to just probability > distributions. Wikipedia lists a disambiguation page for distribution [1] > so perhaps we should be clear that statistics.distribution is applicable to > probability distributions [2]. > > The package javadoc currently states: > > Implementations of common discrete and continuous distributions. > > This can be updated to: > > Implementations of common discrete and continuous probability distributions. +1 Gilles > > [1] https://en.wikipedia.org/wiki/Distribution#In_mathematics > [2] https://en.wikipedia.org/wiki/Probability_distribution > > > > > > > In other libraries for continuous functions they implement only the > > > probability density function (PDF) and the cumulative distribution > > function > > > (CDF) for both continuous and discrete distributions. There is no > > > additional probability function. > > > > > > Thus the method has no use in the current library. Here are two options: > > > > > > 1. Remove the method > > > > +1 > > > > Thanks, > > Gilles > > > > > 2. Implement the method in the ConstantContinuousDistribution to return 1 > > > when the value equals the constant value. It currently does this for the > > > density function but probability(x) will return zero for all values so > > it a > > > bug. This behaviour was ported from Commons Math 3. I find no continuous > > > distributions that override the probability method there either. > > > > > > Alex > > > > > > [1] https://en.wikipedia.org/wiki/Dirac_delta_function > > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
