| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Julien Rouhaud <rjuju123(at)gmail(dot)com> |
| Cc: | Daniel Gustafsson <daniel(at)yesql(dot)se>, eric(dot)mutta(at)gmail(dot)com, pgsql-docs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Should 'sum(mvf)' read 'sum(mcv)'...? |
| Date: | 2022-08-22 12:58:31 |
| Message-ID: | 255694.1661173111@sss.pgh.pa.us |
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| Lists: | pgsql-docs |
Julien Rouhaud <rjuju123(at)gmail(dot)com> writes:
> On Sun, Aug 21, 2022 at 11:02:04PM +0000, PG Doc comments form wrote:
>> It appears the above sentence is referring to the "(1 - sum(mvf))" portion
>> of the formula, however I am not sure what "mvf" is referring to
>> there...shouldn't it be "(1 - sum(mcv))" in order to match what the
>> explanatory sentence is saying?
> It should be mcf, ie. Most Common Frequencies. It looks like a very old typo
> that survived until now.
I don't think it's a typo exactly, but an odd abbreviation for "Most
common Values' Frequencies". (Summing the MCVs themselves isn't
sensible; they might not even be numeric.)
I'd vote for replacing mvf in both places with something a bit more
spelled-out, perhaps "mcv_freqs".
regards, tom lane
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