At the following address
http://web.tiscali.it/wiseminosse/index.html#danalysis.html
you can find DistAnalysis-1.0, a PostgreSQL module for graphical analysis of
parameter distributions and functional relations.
The module has been developed to perform some data analyses over million
records
telephone calls traffic tables, but can adapt to any kind of test, even if
its vocation
is not to produce few intervals distribution histograms over small data
sets.
Regards,
David Ciarniello