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From: "Bruno Luong" <b.luong@fogale.findmycountry>
Newsgroups: comp.soft-sys.matlab
Subject: Re: probability based on trials of 2 variables
Date: Thu, 29 Apr 2010 17:17:04 +0000 (UTC)
Organization: FOGALE nanotech
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You should look at

regression
data fitting
polyfit
incertitude estimation
correlation
conditional probability
Bayesian

The difficulty is not really find an existing canned tool, but find the right tool to your specific need.

Bruno