"Rotation" => Orthogonal design

Posted by John Taylor on October 12, 1999 at 01:48:00:

In Reply to: "Rotation" creating utility..? Where? posted by Anthony Malena on October 11, 1999 at 13:02:51:

If I understand correctly, you are trying to make sure each concept/product is tested by the same number of 18-34 year old males, for example. Is order (of presentation) bias an issue?

This sounds like the same issue faced in selecting specific sets of features to use in "whole concept" trade-off (or conjoint) designs. Trade-off uses orthogonal designs to select the combinations of features. The first objective is to make sure each level of an attribute appears the same number of times.

Since I do not own any conjoint software I don't know if they provide a utility for selecting the levels for each concept. If so, that might provide a solution for you.

Follow Ups:

• Re: "Rotation" => Orthogonal design Herb Sorensen 17:53:01 10/12/99 (3)
  • Rotation design utility - SPSS has one... Anthony Malena 14:18:21 10/14/99 (2)
    • Re: Rotation design utility - SPSS has one... Herb Sorensen 13:46:12 10/15/99 (1)
      • Semi-random block design Ruby 11:37:30 10/17/99 (0)

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