Re: RCT assignment

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1 total messages Started by Michael P. Cohen Fri, 23 Jul 1993 18:14

#1187

Author: Michael P. Cohen
Date: Fri, 23 Jul 1993 18:14

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This is in response to Greg Maislin's problem of
assigning 300 subjects to 3 groups so that
each block of 30 subjects is "balanced" (has 10
subjects in each group).

I would do it like this:

(1)  Assign a block code to each consecutive block
of 30 subjects.  At the same time, assign a random
number to each subject.

(2)  Sort the subjects by block code and random number.

(3)  Assign the first 10 subjects in a block to group
A, the next 10 to group B, and the last 10 to group C.

(4)  Re-sort by ID code to get back the original ordering.

Michael P. Cohen
National Center for Education Statistics
Washington, DC 20208-5654
Internet xic@cu.nih.gov

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