topic Re: split-split-plot design with multi year data in SAS Procedures

split-split-plot design with multi year data

llm1 — Mon, 12 Dec 2016 16:53:18 GMT

how to analyze data from a split-split-plot design with multi years? Would the following code work?

wc is whole plot factor, n is the sub plot factor, and sr is the sub-sub plot factore.

proc mixed data=file2;

class year rep wc n sr;

model plants=rep year*rep year|wc|n|sr;

random year*rep*wc year*rep*wc*n;

Thanks!

Re: split-split-plot design with multi year data

SteveDenham — Mon, 12 Dec 2016 17:55:41 GMT

Same plots from year to year, so that these are repeated measures in time as well?

At least remove rep from the model statement, and move to a RANDOM statement. Maybe something like:

proc mixed data=file2;
class year rep wc n sr;
model plants= year|wc|n|sr;
random intercept year year*wc year*wc*n/subject=rep;
repeated year/type=un subject=rep;
run;;

Steve Denham

Re: split-split-plot design with multi year data

llm1 — Mon, 12 Dec 2016 17:55:36 GMT

no, new site new trial each year.