Hi, I am analyzing data from a randomized block design study. We have two independent variables (Treatment and Site), two covariate and one blocking factor (categorical). As I use a block design, I wonder what is a proper way to set up an ANCOVA model. I use SAS EG to do the analyses but I've told that mayneed to modified the code myself to include a blocking factor. Do I just add one more factor in the classification variable option in Linear Model? How can I make sure that SAS would treat the block variable separately from the two independent variables I have? Below is my code from SAS EG. PROC GLM DATA=work1; CLASS Treatment Site Block; MODEL Tb_BVTV= Treatment Site Treatment*Site Block Covariate(1) Covariate (2) / SS3 SOLUTION SINGULAR=1E-07 ; LSMEANS Treatment Site Treatment*Site / PDIFF=ALL ADJUST=TUKEY ; RUN; Any advice would be appreciated. Thank you!
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