If you do not specify a REPEATED statement, the WEIGHT statement
operates exactly like the one in PROC GLM. In this case PROC MIXED
replaces X'X and Z'Z with X'WX and Z'WZ, where W is the diagonal weight matrix. If you
specify a REPEATED statement, then the WEIGHT statement replaces
R with LRL, where L is a diagonal matrix with
elements W-1/2. Observations with nonpositive or missing
weights are not included in the PROC MIXED analysis.
- WEIGHT variable ;
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