From: Kemin Zhou <kemin.zhou@ferring.com>
To: pgsql-sql@postgresql.org
Subject: aggregate function stddev
Date: Wed, 08 Sep 2004 14:11:38 -0700
Message-ID: <413F758A.80306@ferring.com> (raw)
Implementers:
Just noticed that the postgres stddev is the stddev_sample formula.
There are two different ways to calculate this value.
Their difference is very small with large samle size. It would be nice
to distinguish the two different versions.
I also noticed that oracle has stddev_sample and stddev_population.
This is just a wish list.
Kemin
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To: pgsql-sql@postgresql.org
Cc: kemin.zhou@ferring.com
Subject: Re: aggregate function stddev
In-Reply-To: <413F758A.80306@ferring.com>
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