-----Original Message-----
From: Statisticians_group@... [mailto:Statisticians_group@...] On Behalf Of Jimmy Verner
Sent: 04 May 2006 23:32
To: Statisticians_group@...
Subject: [Statisticians_group] Squared independent variables

Why and under what circumstances would we want to used squared 
independent variables?

For example:  Y = a + bx + bx2 + e  (where the "2" is a superscript)

I can't find anything about this in Gujarati or anywhere else.

Thx.

Jimmy Verner
Graduate Student
School of Social Sciences
University of Texas - Dallas