st: Orthog command in Stata

["student19767" <anurag.sharma@anu.edu.au>]

Hi,
I am trying to use orthog command for some of the variables in the 
data set. I am using the following command:

orthog x1 x2 x3, gen(u1 u2 u3) mat(R)
        matrix c = R[1...,"x1"]
        matrix c = c'    
        matrix score double samepr = c
        compare x1 samepr

The output I am getting is this:

				----------	difference	------
----
			count	minimum	average	maximum
						
samepr	missing	only	2
			----------
total			2

I am getting missing values in u2 and u3 while u1 is  [1 -1]`

Am I missing something here?

Thanks
Anurag 



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