Analysis of split plot design with full factorial vs RSM
I have a split plot design with A,B,C,D factor. C was used as blocking. D was assigned as uncontrolled.1. When analysed by the model script, R is coming as 1. I tried to reduce the model by removed higher order effects E.G A*B*C*D etc. In reduced model A is showing curvature effect with R of 0.93 and AIC of 174.2. I also analysed the response with full factorial effects and reduced higher order e...