On Fri, 2008-12-12 at 02:23 +0000, Greg Stark wrote: > The existing sampling mechanism is tied to solid statistics. It > provides the correct sample size to get a consistent confidence range > for range queries. This is the same mathematics which governs election > polling and other surveys. The sample size you need to get +/- 5% 19 > times out of 20 increases as the population increases, but not by very > much.
Sounds great, but its not true. The sample size is not linked to data volume, so how can it possibly give a consistent confidence range? -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
