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Obviously you did not run my code as written:
. reg smpg shead slength sia2
Source | SS df MS Number of obs
= 74
-------------+------------------------------ F( 3, 70)
= 41.45
Model | 46.7088988 3 15.5696329 Prob > F
= 0.0000
Residual | 26.2911008 70 .375587154 R-squared
= 0.6398
-------------+------------------------------ Adj R-squared
= 0.6244
Total | 72.9999996 73 .999999994 Root MSE
= .61285
------------------------------------------------------------------------------
smpg | Coef. Std. Err. t P>|t| [95% Conf.
Interval]
-------------
+----------------------------------------------------------------
shead | -.0222636 .0852974 -0.26 0.795 -.
1923839 .1478566
slength | -.7948497 .0837613 -9.49 0.000 -.9619065
-.627793
sia2 | .0832287 .0736453 1.13 0.262 -.
0636523 .2301096
_cons | -6.66e-09 .0712426 -0.00 1.000 -.
1420888 .1420888
------------------------------------------------------------------------------
. reg mpg headroom length ia2, beta
Source | SS df MS Number of obs
= 74
-------------+------------------------------ F( 3, 70)
= 41.45
Model | 1563.44248 3 521.147492 Prob > F
= 0.0000
Residual | 880.016983 70 12.5716712 R-squared
= 0.6398
-------------+------------------------------ Adj R-squared
= 0.6244
Total | 2443.45946 73 33.4720474 Root MSE
= 3.5457
------------------------------------------------------------------------------
mpg | Coef. Std. Err. t P>|
t| Beta
-------------
+----------------------------------------------------------------
headroom | -.1522544 .583323 -0.26 0.795
-.0222636
length | -.2065272 .0217639 -9.49 0.000
-.7948497
ia2 | .6077389 .5377608 1.13
0.262 .0832287
_cons | 60.25667 3.550618 16.97
0.000 .
------------------------------------------------------------------------------
In this output the slopes in the model using standardized variables
are identical to the respective beta coefficients on the original
variables.
Kit Baum | Boston College Economics & 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 Apr 22, 2009, at 02:33 , statalist-digest wrote:
I tried it out and got different figures for the beta coefficient.
Thats why I asked that question.
It should give me the same figures, right?
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