180 likes | 326 Views
CH 8 Factorial Designs. Section 8.1 and 8.2 Two-way Factorials. For describing the interaction effect, it’s is easiest to interpret This is the difference between the A treatment means rather than differences from the overall mean.
E N D
For describing the interaction effect, it’s is easiest to interpret • This is the difference between the A treatment means rather than differences from the overall mean. • We could find a confidence interval for this to describe the size of the interaction effect
We can also do an ANOVA with blocks • By including block effects similar to the A and B main effects. • Often interactions with blocks are not included in the ANOVA. • Other software such as Design Expert or SAS-JMP are simpler to use for these more complicated analyses.