Re: wip: functions median and percentile

From: David Fetter <david(at)fetter(dot)org>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: wip: functions median and percentile
Date: 2010-08-19 17:14:58
Message-ID: 20100819171458.GB17368@fetter.org
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers pgsql-rrreviewers

On Thu, Aug 19, 2010 at 12:12:12PM -0500, Kevin Grittner wrote:
> David Fetter <david(at)fetter(dot)org> wrote:
>
> > Median may be useful, but we pretty much can't just call it
> > "median." Instead, we need to call it something like "left_median"
> > or "arithmetic_median."
>
> I think it would be reasonable, and perhaps preferable, to use just
> "median" for the semantics described in most dictionaries -- for
> example, this:
>
> http://www.merriam-webster.com/dictionary/median
>
> If you do a google search for "median" and poke around, you'll find
> many places where this is the only definition mentioned; the others
> seem to be rather infrequently used. Why not make the commone usage
> convenient?

The reason not to is the same reason that MEDIAN doesn't appear in the
SQL standard, namely that what's common in one field is wrong in
another.

Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
Skype: davidfetter XMPP: david(dot)fetter(at)gmail(dot)com
iCal: webcal://www.tripit.com/feed/ical/people/david74/tripit.ics

Remember to vote!
Consider donating to Postgres: http://www.postgresql.org/about/donate

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Tom Lane 2010-08-19 17:18:57 Re: CommitFest 2009-07: Yay, Kevin! Thanks, reviewers!
Previous Message Kevin Grittner 2010-08-19 17:12:12 Re: wip: functions median and percentile

Browse pgsql-rrreviewers by date

  From Date Subject
Next Message Tom Lane 2010-08-19 17:25:36 Re: wip: functions median and percentile
Previous Message Kevin Grittner 2010-08-19 17:12:12 Re: wip: functions median and percentile