Re: st: Polynomial OLS - Interpreting results

[Claude Francoeur <claude.francoeur@hec.ca>]

We were expecting to have 2 bends in our model (y = X1 X1squared 
X1cubed). The results show only one change of sign between Xsquared and 
Xcubed. Coefficient of X1 is negative and significant, coeff. of X1 
squared is negative and not sig. and coeff. of X1 cubed is positive and 
significant. How should we interpret these results (see a tentative 
interpretation in the original post)?

Many thanks!
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/