<>
Mykhailo,
I cannot test the capabilities of -dtobit- because that routine
(updated for sg144_1, from SJ 4:3) does not run the example in its
help file:
. tobit mpg trunk weight, ll(17)
Tobit regression Number of obs
= 74
LR chi2(2)
= 73.86
Prob > chi2
= 0.0000
Log likelihood = -163.74787 Pseudo R2
= 0.1840
------------------------------------------------------------------------------
mpg | Coef. Std. Err. t P>|t| [95% Conf.
Interval]
-------------
+----------------------------------------------------------------
trunk | -.1487203 .1477163 -1.01 0.317 -.
4431875 .1457468
weight | -.0063328 .0008709 -7.27 0.000 -.008069
-.0045966
_cons | 41.90603 2.094632 20.01 0.000
37.73045 46.0816
-------------
+----------------------------------------------------------------
/sigma | 3.822488 .3637359 3.097394
4.547582
------------------------------------------------------------------------------
Obs. summary: 18 left-censored observations at mpg<=17
56 uncensored observations
0 right-censored observations
. dtobit
[_se] not found
r(111);
Apparently some changes made to -tobit- have broken -dtobit-.
However I would wonder whether you can what you need with the various
options available on -mfx-, see -help tobit postestimation-. The
default output provides
. mfx
Marginal effects after tobit
y = Fitted values (predict)
= 20.738523
------------------------------------------------------------------------------
variable | dy/dx Std. Err. z P>|z| [ 95%
C.I. ] X
---------
+--------------------------------------------------------------------
trunk | -.1487203 .14772 -1.01 0.314 -.438239 .
140798 13.7568
weight | -.0063328 .00087 -7.27 0.000 -.00804 -.
004626 3019.46
------------------------------------------------------------------------------
and other options are available. -mfx- saves everything it produces,
and those matrices can be added to -estimates- and output with -
esttab- or other table-making programs.
Presumably someone from StataCorp will have a look at -dtobit-, as it
was written and modified by StataCorp employees (but is not part of
official Stata).
Cheers
Kit
Kit Baum | Boston College Economics and DIW Berlin | http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
On Mar 20, 2009, at 24:42 , msyrotenko wrote:
Dear Kit,
I have a question to you about Stata.
I am working with dtobit command to receive the marginal effects.
. dtobit, brief
------------------------------------------------------------------------------
| Marginal Effects at Means
|--------------------------------------------------------------------
| Latent Unconditional Conditional
on Probability
Name | Variable Expected Value being Uncensored
Uncensored
---------
+--------------------------------------------------------------------
l_gdp | 2.1510068 .03051076 .
22277649 .00370306
l_dist | -11.960954 -.16965905 -1.2387778
-.02059134
dev*| -.95325248 -.01298252 -.09792999 -.
00158439
---------
+--------------------------------------------------------------------
(*) dF/dx is for discrete change of dummy variable from 0 to 1
Now I would like to extract the columns of this table separately
(Latent variable, Unconditional expected value; Conditional expected
Value, Probability Uncensored) Than I would like receive the general
table for different regressions but sepparately for: Latent
variable, Unconditional expected value, Conditional expected Value,
Probability Uncensored.
using command "estimates store" a few times
and then esttab I receive the table only for Latent variable(first
column).
So "estimates store extract" only first column of the initial table
Is it possible to extract other than first column of the initial
table?
What command can help me for this purpose?
Thanks in advance for any suggestion.
Have a nice day.
Mykhailo Syrotenko
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