Date:         Thu, 23 Feb 2006 10:05:36 -0800
Reply-To:     STAT_naive <bhawna.goel@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         STAT_naive <bhawna.goel@GMAIL.COM>
Organization: http://groups.google.com
Subject:      help on Randomization needed
Comments: To: sas-l@uga.edu
Content-Type: text/plain; charset="iso-8859-1"

hi everyone
need help on randomization by stratification and blocking.

Q 1 What is the minimum block size for a trial of 3 treatment groups,
stratified by 3 clinics and a severity index of mild Vs moderate, and
an allocation ratio of 1:1:2 ? How many different sets of permuted
blocks are needed ?


Q 2. How many distinct permuted blocks are possible given two treatment

groups, 2:1 allocation and a block size of 6? (For example AABAAB and
ABABAA are distinct permuted blocks of size 6). ?


CAN ANYONE PASS ON SOME HINTS??


Thanks.