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Re: st: Re: Calculate beta values for mim results
Hi Martin,
Thank you for your input and understanding. I appreciate your time in
responding. The "e(sample)" part of the syntax was my question. Also,
my goal is to calculate the beta values for the parameters estimated
from the -mim- procedure over 5 imputed data sets. The mim procedure
provides the b-coefficients but not the standardized betas. So that I
understand your syntax correctly, will it accomplish this task? I
apologize for any misconceptions about my message. Thank you.
Best,
Frank
On May 1, 2009, at 8:36 AM, Martin Weiss wrote:
<>
Let me spell out the line
-qui reg pr we f rep tr tu-
unabbreviated :
-quietly regress price weight foreign rep78 trunk turn-
-quietly- requests that the results of the estimation command not be
shown. The command -regress- requests an OLS regression, followed by
the dependent and several independent variables. It is not an IV
estimator, though. See -ivregress- for an IV method.
BTW, welcome to the Stata community, I hope to see you on the list
again soon. It is very good of you to let us know that you are a
beginner, so in future, I can tailor my answer better and, for
instance, not use abbreviations on the scale I did in my initial post...
I am not sure about the "sample" thing. Could you rephrase your
question?
HTH
Martin
_______________________
----- Original Message ----- From: <[email protected]>
To: <[email protected]>
Sent: Friday, May 01, 2009 2:48 AM
Subject: Re: st: Re: Calculate beta values for mim results
Hi Martin,
Thank you very much for the reply. I am VERY NEW to Stata. I am
using version 10. I assume that pr is the DV and we f rep tr tu are
the IVs. Is there something that should replace "sample" such as
_mj? I need to calculate the beta values for the -mim- run on 5
imputed data sets. Thank you.
Best,
Frank
On Apr 30, 2009, at 6:50 PM, Martin Weiss wrote:
<>
If you think it is appropriate to do so, you can recover beta
coefficients manually yourself. As far as I can tell, that is
pretty much what -betacoef- does internally.
*********
*to recover beta coefficients
sysuse auto, clear
qui reg pr we f rep tr tu
qui sum pr if e(sample)
sca sd=r(sd)
qui tabstat we f rep tr tu if e(sample), ///
statistics( sd ) columns(variables) save
mata
sds=st_matrix("r(StatTotal)")'
mata stata qui reg pr we f rep tr tu
bs=st_matrix("e(b)")[1..5]'
beta=bs:*sds:/st_numscalar("sd")
beta
end
*check
reg pr we f rep tr tu, beta noheader
******
HTH
Martin
_______________________
----- Original Message ----- From: <[email protected]>
To: <[email protected]>
Sent: Thursday, April 30, 2009 10:35 PM
Subject: st: Calculate beta values for mim results
Dear All,
Can I calculate beta values besides the standard estimates that
the - mim- command produces? I tried using the below commands,
but results returned no values. Thank you.
Best regards,
Frank
mim: regress y x1 x2.....
mim, storebv
betacoef
return list
matrix list r(beta)
Results:
r(beta) [1,23]
x1 x2... _cons
. . 0
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