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DannyWeathers
‎09-01-2015
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Re: Is it possible to specify 3 repeated factors in Proc Mixed?

by Calcite | Level 5 in Statistical Procedures
‎06-02-2014 11:02 AM
‎06-02-2014 11:02 AM
Steve,  You guessed right.  Each price did have 3 levels.  Each subject evaluated 27 product "bundles."  Each bundle contained the same 3 products, and the prices of each product were manipulated at 3 levels each.  Subjects rated the attractiveness of the overall bundle.  I'll consider ways to reparameterize the model, but our goal is to test for possible interactions between the prices. Thanks for your help. Danny ... View more

Is it possible to specify 3 repeated factors in Proc Mixed?

by Calcite | Level 5 in Statistical Procedures
‎05-30-2014 03:09 PM
‎05-30-2014 03:09 PM
I'm trying to specify three repeated factors in Proc Mixed.  I'm able to specify one or two repeated factors depending on the covariance structure specified in the Repeated statement.  (Two repeated factors seems to require Type=un@cs or Type=un@un.)  However, I've had no success with three repeated factors.  Is it a matter of specifying the appropriate covariance structure, or does Proc Mixed not handle more than 2 repeated factors? Below is the code I'm running.  The data is stacked as it should be. proc mixed data=subject5; class subject pricea priceb pricec; model rate=pricea|priceb|pricec/ddfm=kr; repeated pricea priceb pricec/subject=subject type=un@un; run; Thanks for any help anyone can provide. ... View more
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