I need to conduct conjoint analysis.
I have four factors each with three levels of attributes.
Total number of cards is 81. It's too much for a person to range.
Thus I generated an orthogonal array using SPSS. It has 27 cards. It's
much
less than 81 ;-). But why does it have duplicated cards?
If I delete duplicates of the cards, than this plans is not orthogonal.
What should I do?
Thanks in advance,
Irina.
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