Repeated and Random effect in Proc Mixed

[Teketo]

Hi,
I have got a repeated measures data and I want to determine whether men over time (measurement was taken weekly basis) have higher outcome values compared with women.

I am very pleased to have your advice on the use of random statement and repeated statement in a Repeated Measures Model (Proc Mixed).

What is the main difference between using Random statement with fixed effects in Proc Mix, and Repeated statement with fixed effects in Proc Mixed?

Is it possible to use both Random statement and Repeated statement in one Proc Mixed model? What is the overall gain if it works?

Regards
Teketo

[Rick_SAS · Accepted solution]

Many programmers struggle with whether to use the RANDOM or REPEATED statements. I recommend the following papers by 

Tao, Kiernan, and Gibbs, which have examples and SAS code:

• "Tips and Strategies for Mixed Modeling with SAS/STAT Procedures"
• "Advanced Techniques for Fitting Mixed Models Using SAS/STAT Software"