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st: partial()-option of xtivreg2


From   Jessica Ölschläger <jessica.oelschlaeger@uni-hohenheim.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: partial()-option of xtivreg2
Date   Thu, 20 Dec 2007 12:55:50 +0100

Dear Statalisters,

I'm trying to fit following model using xtivreg2. (I'm using an unbalanced
panel data set.)

xtivreg2 gwgdpvdpc  ln_openquota_oecd ln_govbaladj_oecd  ln_unemployment
ln_lgovinvquota  outputgap l.totalpop   rintratelt syr   termstrade  fdiin
t1100gdp t1200gdp t2000gdp t3000gdp t5000gdp  if year >=1990, fd
cluster(coid)

Doing this, stata gives me the warning:

Warning: estimated covariance matrix of moment conditions not of full rank.
         standard errors and model tests should be interpreted with caution.
Possible causes:
         number of clusters insufficient to calculate robust covariance
matrix
         singleton dummy variable (dummy with one 1 and N-1 0s or vice
versa)
partial option may address problem.

My question is, how should I use the partial-option? I've got a real problem
with understanding the syntax correctly. I always get the same error
message, e.g. when I try:

. xtivreg2 gwgdpvdpc  ln_openquota_oecd ln_govbaladj_oecd  ln_unemployment
ln_lgovinvquota  outputgap l.totalpop   rintratelt
>  syr   termstrade  fdiin   t1100gdp t1200gdp t2000gdp t3000gdp t5000gdp
if year >=1990, fd cluster(coid) partial(ln_openqu
> ota_oecd ln_govbaladj_oecd  ln_unemployment ln_lgovinvquota  outputgap)

Error: ln_openquota_oecd ln_govbaladj_oecd ln_unemployment ln_lgovinvquota
outputgap listed in partial() but not in list of r
> egressors.
invalid syntax

Could anybody please give me a hint what I am doing wrong?
Any comments would be greatly appreciated.

Regards 

Jessica
 
----------------------------------------------------------------
Dipl. oec. Jessica Ölschläger
 
Forschungsstelle Europäische Integration
Universität Hohenheim


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