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Re: st: A problem with -pstest- command
This posting raises questions on various levels.
I note that the programs referred to are downloadable
from SSC and the reference given is supplied in full
in psmatch2.hlp. As in a concurrent thread, posters are
asked to provide explanation of sources.
I don't see how anyone can be expected to comment on your Excel
calculations.
I don't follow your implication that a program downloaded
twice might be expected to give different answers the second time.
In short, I think you need to say more for experts in this
topic to be able to comment more fully.
Nick
[email protected]
Alvaro Zevallos
I�m testing the quality of matching estimators of five ATT parameters
and i�m using the - pstest- command after - psmatch2 -, but i stopped
because i have problems with the results, specifically with the
�Standardised Bias� Column.
When i replicated the Standardised Bias equation of Rosenbaum and Rubin
(1985) for all my covariates in Excel the results were the same as
the -pstest-�s only for unmatched means.
I was trying to find an explanation for the differences between the matched
means and I found that the -pstest- command uses the square root of the
average of sample variances before matching as the denominator of the
�standardised bias� after matching equation. I downloaded the command
again but that didn�t solve the problem.
What am I doing wrong?
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