Do we have to control for block in block designs if it is insignificant?
The short answer is "no" (meaning to leave the blocks in the model). As Frank Harrell said, you've spent your degrees of freedom. Go home and be happy. Best, Andy From: J S
Sent: Tuesday, March 24, 2009 9:49 AM To: r-help at r-project.org Subject: [R] Do we have to control for block in block designs if it is insignificant? I am wondering if in a block experimental design (ex. triple square lattice), the block effect was not significant, is it all right not to include the block effect in an empirical model (even though the sampling was done from different blocks)? Or we are forced to control for the block effect in block designs anyway? Thanks, Julia
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