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st: test predicted values

From   "Dawit Lidia" <[email protected]>
To   [email protected]
Subject   st: test predicted values
Date   Sun, 16 Jan 2005 00:27:56 +0000

Dear All,

I am running the following types of regressions

areg y1 x1 x2 if con ==1, absorb(hhno) cluster(hhno)
predict conhat if con ==1, xbd

areg y2 x1 x2 if con ==0, absorb(hhno) cluster(hhno)
predict wconhat if con ==0, xbd

y1 and y2 are dependent variables and xs are independent variables.

I want to test if there is mean difference between the two predicted values uisng simple 'ttest'.

My question is, do I need to correct standard errors(se) of the 'ttest' since the observed ys are not independent. If the answer is yes, would you please suggest me how i can correct it or any other altenative test that can adjust se.

Many thanks

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