Programming the statistical procedures from SAS

Quadratic plateau model in Proc Mixed

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Quadratic plateau model in Proc Mixed

Hi all,

I do want to fit a quadratic plateau model for dry matter biomass. The two
classification variables are crop variety and nitrogen rate.  Nitrogen rates
are equally spaced. I have seen there is an example to do something like
that with PROC NLIN. Since, my model is mixed as blocks (replications) are
random effects so I have to use Proc Mxed. I haven't found anything done
like this.

I have set up linear model as-

PROC MIXED DATA=wheat;
CLASS Plot Block Variety Nrate sampling;
MODEL TotalDM = Variety|Nrate|Sampling;
RANDOM Block block*Variety block*Variety*Nrate;
PARMS (41) (1) (2) (1) (1) / noiter;
REPEATED sampling / SUBJECT=Plot Type=CS R RCORR ;
RUN;


Any suggestion?

Thanks
Bhupinder

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