hie
i am want to carryout a longitudinal analysis similar to the proc
catmod in SAS using The Weighted least squares method.my data is in the
following format.
Material time1 time2 time3
1
1
1
1
1
1
2
2
2
2
2
3
3
3
.
.
.
.
13
what i want to do is compare if there is a significant difference between the
materials.
and also if there is any sig difference between the times.
any help will be greatly apreciated
thanks
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