If you have four factors (call them A, B, C, and D) in an ANOVA experiment with replication, you could have a maximum of four different two-factor interactions.

Name: If you have four factors (call them A, B, C, and D) in an ANOVA experiment with replication, you could have a maximum of four different two-factor interactions.
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With four factors (A, B, C, and D), you can have six different two-factor interactions: AB, AC, AD, BC, BD, and CD.

If You Have Four Factors (Call Them A, B, C