Thank you Tom, that's exactly what I meant. I believe the term "clustering factor" is well-known: http://use-the-index-luke.com/glossary/index-clustering-factor What is the right word to use instead in Postgres universe? -- View this message in context: http://postgresql.nabble.com/Is-clustering-factor-stored-in-pg-stats-correlation-tp5831610p5831615.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general