On 7/4/13 9:26 AM, sebb wrote: > On 4 July 2013 16:46, William Speirs <wspe...@apache.org> wrote: >> The Frequency[1] class is what you're looking for. You can find a basic >> example of it in the user guide [2]. > Perhaps the docs should include "mode" as an example as well? > Or maybe it should be added to the Frequency class? (and StatUtils) > > AFAICT the only way to get the mode is to scan all the entries looking > for the the maximum count, caching the value(s) on the way. > This is not completely trivial.
Right. That is what Frequency does, essentially. It would make sense to add a method to Frequency returning a collection or double[] (since mode is not well-defined - i.e., there can be several equiprobable maxima of the pmf). Then add a convenience method (possibly multiple, for different input data types) to StatUtils that uses this. Might also make sense to add mode as a (single-valued) property of IntegerDistribution. Will be NaN sometimes, but same is true of mean and variance. Patches welcome! Phil > >> Bill- >> >> [1] >> http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/stat/Frequency.html >> [2] >> http://commons.apache.org/proper/commons-math/userguide/stat.html#a1.3_Frequency_distributions >> >> >> On Thu, Jul 4, 2013 at 11:29 AM, Matt Benson <gudnabr...@gmail.com> wrote: >> >>> I don't know about [math], but [lang] 3.x has mean, median and mode in >>> ObjectUtils. >>> >>> Matt >>> On Jul 4, 2013 10:25 AM, "Ben Titmarsh" <ben.titma...@hotmail.co.uk> >>> wrote: >>> >>>> Hi, >>>> >>>> I am looking for a library that can provide the mode ( >>>> http://en.wikipedia.org/wiki/Mode_%28statistics%29) of a set numbers. >>>> This is a simple arithmetic operation but I am unable to find a reference >>>> to this in the documentation. Can anyone point it out to me, if not >>>> suggest why it is not supported? >>>> >>>> Thanks, >>>> Ben. >>>> > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
