On Sun, 18 Mar 2007, Al Leong wrote:
 ? gmm e=lpackpc - b0 - b1*lravgprs -b2*lperinc
 ? orthog e; Z
 Syntax error in command line 
Sorry, the syntax requirement there is too persnickety.  I will 
fix that for 1.6.2 (due out soon, with various quick fixes).
Meanwhile, you need to ensure there's a space before the semicolon 
in an orthogonality condition:
  orthog e ; Z
Allin Cottrell