At 12:12 PM 12/30/2008, Claude Francoeur wrote:
Hello,
First, I would like to thank Maarten Buis and Ángel Rodríguez Laso for
their advice (see Polynomial OLS - Dec 25th).
Doing a polynomial OLS and after centering the original variable, we get
the following results :
Coefficient of X1 (the centered variable) is negative and significant;
coeff. of X1 squared is negative and not sig. and coeff. of X1 cubed is
positive and significant.
What would be the graphic representation of such a relation? Is there
only one inflexion point here (between X1 squared and X1 cubed)?
This handout might be helpful:
http://www.nd.edu/~rwilliam/stats2/l61.pdf
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Richard Williams, Notre Dame Dept of Sociology
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