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






      
	[[alternative HTML version deleted]]

