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st: AW: Interaction with squared variable


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: Interaction with squared variable
Date   Tue, 13 Oct 2009 16:41:12 +0200

<> 


*************
sysuse auto, clear
reg price for weight c.weight#c.weight for#c.weight#c.weight
*************

should be close to what you want...


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Giuseppe
Cappelletti
Gesendet: Dienstag, 13. Oktober 2009 16:12
An: [email protected]
Betreff: st: Interaction with squared variable

I would like to estimate an orderd probit model with the following
specification:

Prob(y=1) = x + a*gender + b*x + c*x^2 + d*gender*x^2

I tried the following command:

oprobit  y  ///
   i.gender   ///
   c.x   ///
   c.x#c.x  ///
   i.gender#(c.x#c.x)

but it does not work. After the estimation I would like to compute the
marginal effect (considering both the squared and interaction term).

Thanks in advance

Giuseppe

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