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06-24-2015 10:06 PM

Hello,

I have a Strip-Split-Plot design with SAMPLING on the lowest plot. I already have done hard work researching and did not get final conclusion if I even must use a subsample error term and if what is correct error for the sub-sampling in these design.

I wrote the code below, and would be great full if someone could help me suggestim a better one.

PlotA=main plot, and within each PlotA I have a strip-plot with Row factor and Col factor. (With SUBSAMPLING)

PROC GLIMMIX data=dataset plots=studentpanel;

Class Block PlotA Row Col;

Model Y=PlotA | Row | Col / ddfm=satterthwait;

Random Block(PlotA) Row*Block(PlotA) Col*Block(PlotA) Row*Col*Block(PlotA);

run;

Thank you.

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Solution

06-29-2015
03:09 PM

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Posted in reply to GBR2015

06-29-2015 03:09 PM

If by "randomized complete block (RCB) with Factor 'A' with 'a' levels", you mean that each level of A is applied to a whole plot (identified as "Block*A") within each block--in other words, you have 'a' whole plots in each block--and that the row strips and the column strips are entirely contained within each whole plot, then ideally you would want

random block

block*a

block*row

block*a*row

block*col

block*a*col

block*row*col

block*a*row*col;

Lots of variance estimates! So the full list of terms might not be feasible.

Your original RANDOM statement would be correct if levels of factor A were randomly assigned to blocks rather than whole plots within blocks.

Susan

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Posted in reply to GBR2015

06-26-2015 01:13 PM

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Posted in reply to SteveDenham

06-26-2015 05:46 PM

Thanks Steve Denham

I checked the link and I believe that my code is correct.

Since I have a strip-plot within a simple randomize complete block (RCB) with Factor 'A' with ''a' levels, the interraction 'Block*A' become the "blocks" for the strip-plot, is it OK?

Thank you

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Posted in reply to GBR2015

06-29-2015 08:57 AM

That sounds correct, and also sounds a lot like an example in SAS for Mixed Models, 2nd ed., where an extensive strip plot example is worked out.

Steve Denham

Solution

06-29-2015
03:09 PM

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Posted in reply to GBR2015

06-29-2015 03:09 PM

If by "randomized complete block (RCB) with Factor 'A' with 'a' levels", you mean that each level of A is applied to a whole plot (identified as "Block*A") within each block--in other words, you have 'a' whole plots in each block--and that the row strips and the column strips are entirely contained within each whole plot, then ideally you would want

random block

block*a

block*row

block*a*row

block*col

block*a*col

block*row*col

block*a*row*col;

Lots of variance estimates! So the full list of terms might not be feasible.

Your original RANDOM statement would be correct if levels of factor A were randomly assigned to blocks rather than whole plots within blocks.

Susan

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06-30-2015 12:13 PM

Susan is right--I read it as a split-split plot, not a strip-split plot. Mark her answer as correct.

Steve Denham