PROC MIXED is used to fit mixed effects model for correlated data.
Usually we can use either a REPEATED statment or a RANDOM statement.
The random statement is corresponding to lme function in R -- specifying a
random effect term.
The repeated statement actually directly specifies the covariance structure
-- is there a similar function in R to do this? I currently want to specify
a unstructured matrix. (Of course if i just want to use compound symmetry, i
know i can still use lme.)
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