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st: Testing for Trend Linearity

Subject   st: Testing for Trend Linearity
Date   Thu, 04 Sep 2008 18:08:01 -0700

I ran (in stata 9)
xi: xtpois injury age, i(id)
xi: xtpois injury age i.ageg, i(id)
where "injury" is a binary variable, "age" is continuous and "ageg" is "age" as a categorical variable. All the p-values (age, _Iageg_2, and _Iageg_3) were >0.05.
Does this imply the trend does not deviate from linearity (at the 0.05 level)?
If not, does anyone have a suggestion(s) for a trend test that tests for linearity?

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