| From: | Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
|---|---|
| To: | "Greg Stark *EXTERN*" <stark(at)mit(dot)edu> |
| Cc: | Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Josh Berkus" <josh(at)agliodbs(dot)com> |
| Subject: | Re: ANALYZE sampling is too good |
| Date: | 2013-12-10 14:31:31 |
| Message-ID: | A737B7A37273E048B164557ADEF4A58B17C7E09B@ntex2010i.host.magwien.gv.at |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Greg Stark wrote:
>> Doesn't all that assume a normally distributed random variable?
> I don't think so because of the law of large numbers. If you have a large population and sample it the
> sample behaves like a normal distribution when if the distribution of the population isn't.
Statistics is the part of mathematics I know least of, but aren't
you saying that in a large enough sample of people there will
always be some with age < 0 (which is what a normal distribution
would imply)?
Yours,
Laurenz Albe
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Claudio Freire | 2013-12-10 14:32:14 | Re: ANALYZE sampling is too good |
| Previous Message | Alvaro Herrera | 2013-12-10 14:24:56 | Re: New option for pg_basebackup, to specify a different directory for pg_xlog |