luckyly I don't need to know what is a normal distribution but I think I would check out the many modules in the Statistics:: namespace on CPAN: http://search.cpan.org/search?query=statistics&mode=dist Gabor On 8/24/05, Itamar Elem <elem at compugen.co.il> wrote: > hi > is theres any module which does it? > thanks itamar