<>
The error means what it says, I am afraid:
*************
use http://www.stata-press.com/data/r11/xtfrontier1.dta, clear
gen myproxy=rnormal()
levpet lnwidgets, free( lnworkers) proxy(myproxy) capital( lnmachines)
//let`s disturb things:
replace t=7 if t==8 & id==1
levpet lnwidgets, free( lnworkers) proxy(myproxy) capital( lnmachines) t(t)
i(id)
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Zhang Yan
Gesendet: Mittwoch, 2. Dezember 2009 03:42
An: [email protected]
Betreff: st: help of levpet
Dear
I am Zhangyan, a PhD candidate in Economics.
I am using levpet to calculate TFP. But stata said
"
. tsset frdm year
panel variable: frdm (unbalanced)
time variable: year, 2005 to 2007, but with gaps
delta: 1 unit
. levpet lnva, free( lncyry lnage) proxy( lnzjtrj) capital(lngdzch)
valueadded i
(frdm) t(year) reps(250)
repeated time values within panel
r(451);
"
I have calculate TFP using OP method. Now i want to use intermediate input
to
solve the simultaneous problem.
Would you do me a favor? Thanks a lot!
Best regards!
Yan Zhang
PhD Candidate
Ph : +61 8 8303 4190
e-mail: [email protected]
----- End forwarded message -----
Yan Zhang
PhD Candidate
Ph : +61 8 8303 4190
e-mail: [email protected]
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