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| From | jl591164@albany.edu |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: testing overall quadratic and cubic trends |
| Date | Thu, 16 Sep 2010 16:01:29 -0400 (EDT) |
Dear All, I used orthogonal polynomial terms of time to test a cubic trend of y over time(five waves). The individual coefficients of the three orthogonal polynomials are significant. But to test the overall cubic trend, do i need to test H0: b1+2*b2*t+3*b3*t^2=0? If so, how i conduct this test? Thanks a lot. Junqing * * 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/