Can somebody explain me why I obtain different results if I follow these
alterative codes:
If I perform the following instructions:
clear all
use http://fmwww.bc.edu/ec-p/data/wooldridge/HPRICE1, clear
set seed 10
psmatch colonial, est( bdrms lotsize sqrft) kernel(price) boot
reps(20) double dot
set seed 10
psmatch colonial, est( bdrms lotsize sqrft) kernel(price) boot
reps(20) double dot
I get exactly the same results in both executions of psmatch.
However if I do the following:
clear all
use http://fmwww.bc.edu/ec-p/data/wooldridge/HPRICE1, clear
gen nn = _n
sort nn
set seed 10
psmatch colonial, est( bdrms lotsize sqrft) kernel(price) boot
reps(20) double dot
sort nn
set seed 10
psmatch colonial, est( bdrms lotsize sqrft) kernel(price) boot
reps(20) double dot
I get two different results!! It seems that psmatch does not clean
internal variables appropriately.
Can any one give me a clue?
Thanks
Javier
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