Dear _all,
Could someone explain how to properly specify the
-preopt()- option in -graph twoway-. I have look in
the manual and in he help file but there is no detail
or examples on how to use it. For example:
. graph twoway  qfit families x
and 
. graph twoway  qfit families x, pred(xb)
produce the same correct plot, but the second one does
nothing with the option.
Thank you,
Ricardo.
=====
Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK
		
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