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st: testing overall quadratic and cubic trends


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

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