I noticed that Processing doesn't have a basic statistics library, so I went ahead and created one.

It's called "papaya" and can be downloaded by clicking on  this link and scrolling down to the "downloads" section, or, if you want to download the .zip file directly, just click here. Further details are provided in the javadoc as well as on the project website ( http://www.holypapayaresearch.com/papayastatistics.html). Source code is included in the downloadable folder too.

Feel free to check it out and let me know what you think,

adila