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Re: st: AW: Interaction with squared variable


From   Nick Winter <nwinter@virginia.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: Interaction with squared variable
Date   Tue, 13 Oct 2009 11:28:50 -0400

I can reproduce this with the auto dataset. Seems like something for technical support...


. regress rep78 i.foreign c.weight c.weight#c.weight i.foreign#(c.weight#c.weight)

<<model estimation output omitted>>

. oprobit rep78 i.foreign c.weight c.weight#c.weight i.foreign#(c.weight#c.weight)

invalid interaction specification;

multiple 'o' operators attached to a single variable are not allowed within an interaction specification{p_end}
r(198);


Nick Winter



Giuseppe Cappelletti wrote:
This is the message I get when I use the command ( oprobit  y
i.gender c.x  c.x#c.x  i.gender#(c.x#c.x) )
"invalid interaction specification;
multiple 'o' operators attached to a single variable are not allowed
within an interaction specification{p_end}"

The same command works if I use a linear model that is regress y
i.gender c.x  c.x#c.x  i.gender#(c.x#c.x).

Thanks  in advance

Giuseppe

<>

" but it does not work".


What exactly does not work? Note the FAQ onthis point...



HTH
Martin
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