10-14-2014 01:53 AM
hi good morning,
i want to know detailed back ground about proc glm and proc mixed! in which situation or case we use this concept and when we prefer this procedures.
10-14-2014 07:34 AM
I refer you to the excellent book SAS for Mixed Models, Second Edition, by Littel et al. There are multiple examples comparing GLM and MIXED, with details throughout.
10-14-2014 08:10 AM
Simple explanation is the coefficient of parameter is also a random variable .
Here is General Linear Model : Y=a + b*X + E < - - E is a random variable
Here is Mixed Model : Y=a +(b+e)*X + E <-- both E and e are random variables .
As Steve point out to check some statistical books.
BTW, I am also a rookie of statistical theory.