Exact name of a quantity involved in probability theory

From: Alex (alex.fontax_at_rocketmail.com)
Date: 09/30/04 

Date: Thu, 30 Sep 2004 12:24:28 +0000 (UTC)

Hi,

I have the following question. In the basic probability theory two
variables are defined dependent if the following quantity is different
 from 1:

P(A1 | A2) / P(A1) = P(A1 & A2) / ((P(A1) x P(A2))

Is there a name or a symbol for this quantity (like dependence
coefficient for instance) ?

Thanks

Alex

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