AW: Geometric mean

From: Stefan Jahnke <Stefan.Jahnke_at_bov.de>
Date: Fri, 14 Nov 2003 04:49:25 -0800
Message-ID: <F001.005D6ABB.20031114044925@fatcity.com>

Hi

I'm not aware of any "out-of-the-box" Oracle solution either (like STDDEV or AVG).
Looks like one has to roll ones own statistical functions when it comes to calculating things like modus or median. Is anybody aware of an extension, maybe in form of an old cartridge or a pl/sql library to handle that stuff ?
The problem is, that for instance STDDEV is a "normal" SQL function, if you roll your own to calculate other things, you end up having to call a pl/sql function from sql, which isn't really a performance boost.

Stefan

-----Ursprüngliche Nachricht-----
Von: Robson, Peter [mailto:pgro_at_bgs.ac.uk] Gesendet: Freitag, 14. November 2003 13:20 An: Multiple recipients of list ORACLE-L Betreff: RE: Geometric mean

Thanks for that, Stephane -

hmmm, I'm still working on it... will post the successful script when I get it...

peter
edinburgh

> -----Original Message-----
> From: Stephane Faroult [mailto:sfaroult_at_oriolecorp.com]
> Sent: Thursday, November 13, 2003 5:24 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Geometric mean
>
>
> Peter,
>
> I am a mere shadow of what I used to be in mathematics,
> but wouldn't
> POWER(10,AVG(LOG(10,<column>)))
>
> do it?
>
> SF
>
> >----- ------- Original Message ------- -----
> >From: "Robson, Peter" <pgro_at_bgs.ac.uk>
> >To: Multiple recipients of list ORACLE-L
> ><ORACLE-L_at_fatcity.com>
> >Sent: Thu, 13 Nov 2003 08:49:24
> >
> >
> >Has anyone any code (SQL, PL/SQL) that will permit
> >the calculation of the
> >geometric mean of 'n' values?
> >
> >appreciated...
> >
> >peter
> >edinburgh
> >
> >
> >ps - yes I know Perl will do it, but that is not
> >the answer...
> >
> >
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Stephane Faroult
> INET: sfaroult_at_oriolecorp.com
>
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-- 
Author: Robson, Peter
  INET: pgro_at_bgs.ac.uk

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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Stefan Jahnke
  INET: Stefan.Jahnke_at_bov.de

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Received on Fri Nov 14 2003 - 06:49:25 CST