Regression Analysis in Numbers '09

It looks like it can do regression, but you have to individually do each statistic, unlike the data analysis toolpak in excel (windows) that does the entire thing in one click of a button. You can also try NeoOffice or OpenOffice for regression when you need to do that. They're free. Then you go add the add ons at the stat site below which largely run on them and do the functional equivalent of the data analysis toolpak:

http://www.coventry.ac.uk/ec/~nhunt/oatbran/

By the way, the add ins also work in Excel Mac 2008.

There is no multiple regression statistical formula available in Numbers 09.

All statistical functions are listed here:

http://www.apple.com/iwork/numbers/functions.html#statistical