My crystal ball is awfully cloudy this evening.
Please explain the context of this question.
You take a lot of data, then do statistical analysis looking for correlation coefficents (including autocorrelation coefficents).
Example: variables: age, gender, race, anxiety in the study of hypertension
You take a lot of data, then do sorting, analysis of the sorts, and look for your correlation coefficents.
I searched Google under the key words "counterbalancing variables" to get these possible sources:
(Broken Link Removed)
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps a little more. Thanks for asking.