Rate of increase/decrease for a set of values

From: "thara" <tharas(at)cdactvm(dot)in>
To: <pgsql-novice(at)postgresql(dot)org>
Subject: Rate of increase/decrease for a set of values
Date: 2009-07-14 08:54:41
Message-ID: 0FE44A44E20845788AA10224E75D9F89@cdac1dab82cc51
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Hello all,

I have a table with two columns - one for survey date and the other one for the number of fever cases registered on that date. Now, I would like to know the overall rate of increase/decrease in the fever cases registered in a particular interval (say, between two dates). Which statistical measure I can use for computing this.

Thanks all. Have a great day!
Thara.

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