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st: AW: svy : heckman

From   "Martin Weiss" <>
To   <>
Subject   st: AW: svy : heckman
Date   Fri, 30 Oct 2009 12:47:41 +0100


There may be no LR test, but Stata does still provide you with a confidence
interval for -rho-. What do you read into this CI?

webuse womenwk, clear
gen weights =int(10*runiform())
svyset _n [pweight=weights],  /* 
*/ vce(linearized) singleunit(missing)
svy linearized : heckman wage educ age,  /* 
*/ select(married children educ age)


-----Ursprüngliche Nachricht-----
[] Im Auftrag von Nefer Liliana
Olarte Rodriguez
Gesendet: Freitag, 30. Oktober 2009 09:05
Betreff: st: svy : heckman

Im working with survey data [pweights].  I used the svy : heckman command
correcting selectivity but i dont know if rho is statistically different
from zero. 
I know LR test cannot be applied when using weights but i don't know how to
implement any other test (Wald Test for example).
Thanks for you attention,
Liliana Olarte

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