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Oct 20, 2014

color map on correlation for a resolution IV fractional factorial

Hello dear All, I run the color map on correlations for a 2 to 6-2 fractional factorial. I would expect the terms A B C D E AB AC AD AE BC BD BE CD CE DE (not considering three-way interactions). I do not understand why AB AC AD and AE are replicated in the map. In other words, I would not expect the red squares parallel to the diagonal ones. Many thanks, Marcello.