Oracle-L: RE: Statistical sampling and representative stats collection

From: <Chaim.Katz_at_Completions.Bombardier.com>
Date: Wed, 22 May 2002 11:00:49 -0800
Message-ID: <F001.004681D3.20020522110049@fatcity.com>

Raj,
Would the temp have gotten the same result by counting the frequencies of the letters in the game of scrabble?
Chaim

"Jamadagni, Rajendra" <Rajendra.Jamadagni_at_espn.com>@fatcity.com on 05/22/2002 11:53:22 AM

Please respond to ORACLE-L_at_fatcity.com

Sent by: root_at_fatcity.com

To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> cc:

I remember, in 96/97, I was working on a Oracle 7 database and none of the this sample() was available. My task was to select x people out of z number of people randomly. We hired a temp, who took Dallas/Fort Worth dictionary
(I was working in that area) and counted (yes counted) number of people
whose last names started with A and B and so on.

We put this information into a table and then found out percentage of last names starting with A compared to the whole list for each letter. This percentage was used as weightage for each letter when choosing random samples from a list of people. Then I used this weightage and dbms_random to
pick the required number of names from our database. It was fun to implement, but I feel bad for the temp who had to count the names.

So, compared to that, 8i and 9i built-in features rock !! Raj

Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

QOTD: Any clod can have facts, but having an opinion is an art!

(See attached file: ESPN_Disclaimer.txt)

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: 
  INET: Chaim.Katz_at_Completions.Bombardier.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L


(or the name of mailing list you want to be removed from).  You may

also send the HELP command for other information (like subscribing).



application/octet-stream attachment: ESPN_Disclaimer.txt

Received on Wed May 22 2002 - 14:00:49 CDT