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Gil
Gil
Community Trekker

Main Effects Power Analysis

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I have a question  regarding design evaluation in JMP: when I'm running power analysis for main effects only, the power is higher for these effects then if I would do analysis with 2nd degree interactions. Do you know why the addition of interactions in the analysis will change the power of the main effects? 

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Accepted Solutions
David_Burnham
Super User

Re: Main Effects Power Analysis

Estimating the additional terms is consuming additional degrees of freedom, which will influence the power of estimation

 

powerdoe.PNG

-Dave
2 REPLIES 2
David_Burnham
Super User

Re: Main Effects Power Analysis

Estimating the additional terms is consuming additional degrees of freedom, which will influence the power of estimation

 

powerdoe.PNG

-Dave
Gil
Gil
Community Trekker

Re: Main Effects Power Analysis

Thanks David. It was helpful. 

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