Hi Gang,
Thank you for the response.
I did try to use amean and bmean but the command gave me the same value for two levels of one factor.
Here is my script
-amean i a1 \
-amean j a2 \
-bmean i b1 \
-bmean j b2 \
The problem is that the value of a1 is the same as a2 and b1 is identical to b2. But, the four values are supposed to be totally different.