> Mean is just sum(col)/count(col)
You can also just use avg(col). Either way, be careful because nulls may not be treated as you want for such calculations. The stats package R can access Postgres databases, and can be used for robust statistical analyses of the data. See: http://sourceforge.net/projects/rdbi/ Cheers, Brent Wood ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
