fit data in multiple dimensions.

[Alta]

I have a bunch of data x1, x2, x3, .... x49, z. I need a function f(x1, x2,... x49)=z. Does anyone have suggestions for a method that they have used before or key words to google?

[KLoux]

This could be a tricky problem... try googling "system identification" or "multiple regression" maybe?

-Kerry