[R] longitudinal data analysis

raymond chiruka
Tue, 17 Jun 2008 12:13:11 -0000

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 &nbsp; time1&nbsp; time2&nbsp;&nbsp;  time3

1&nbsp;&nbsp;  &nbsp;&nbsp;  &nbsp;&nbsp;

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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