Difference between proc glm and proc mixed

[HimaAalamuri]

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.

With Regards,

Hima

[SteveDenham]

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.

Steve Denham

[HimaAalamuri]

thank you

[Ksharp]

Simple explanation is the coefficient of parameter is also a random variable .

E.X.

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.

Xia Keshan

[HimaAalamuri]

thank you soo much both of you ...