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Re: st: Question about scalars
From
Sergiy Radyakin <[email protected]>
To
[email protected]
Subject
Re: st: Question about scalars
Date
Mon, 9 Aug 2010 14:15:28 -0400
Hi, Steve,
there might be something else in your program that prevents it from
running. Both code fragments that you compare work fine in my Stata 9
and Stata 11.
Best, Sergiy
. do "R:\TEMP\STD0h000000.tmp"
. clear
. scalar drop _all
. scalar a = 10
. scalar b = 20
. scalar c = b + a
. scalar dir
c = 30
b = 20
a = 10
.
. sysuse auto, clear
(1978 Automobile Data)
. reg mpg foreign
Source | SS df MS Number of obs = 74
-------------+------------------------------ F( 1, 72) = 13.18
Model | 378.153515 1 378.153515 Prob > F = 0.0005
Residual | 2065.30594 72 28.6848048 R-squared = 0.1548
-------------+------------------------------ Adj R-squared = 0.1430
Total | 2443.45946 73 33.4720474 Root MSE = 5.3558
------------------------------------------------------------------------------
mpg | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
foreign | 4.945804 1.362162 3.63 0.001 2.230384 7.661225
_cons | 19.82692 .7427186 26.70 0.000 18.34634 21.30751
------------------------------------------------------------------------------
. scalar d = _b[foreign]
. scalar e = d + a
. scalar dir a d e // "e" is wrong
a = 10
d = 4.9458042
e = 131
.
. tempname dd
. scalar `dd' = _b[foreign]
. scalar e = `dd' +a
. scalar dir a `dd' e // "e" is /okay
a = 10
__000000 = 4.9458042
e = 14.945804
.
end of do-file
On Mon, Aug 9, 2010 at 1:57 PM, Steve Samuels <[email protected]> wrote:
> In the code below, I generate a scalar "d" from a regression result;
> it looks okay, but trying to add it to another scalar doesn't work.
> If, however I use a -tempname- , I get the right answer. Could
> someone explain to me why the first approach doesn't work and if
> there's another approach that doesn't involve a -tempname-?
>
> Thanks,
>
> Steve
>
> ******************************
> clear
> scalar drop _all
> scalar a = 10
> scalar b = 20
> scalar c = b + a
> scalar dir
>
> sysuse auto, clear
> reg mpg foreign
> scalar d = _b[foreign]
> scalar e = d + a
> scalar dir a d e // "e" is wrong
>
> tempname dd
> scalar `dd' = _b[foreign]
> scalar e = `dd' +a
> scalar dir a `dd' e // "e" is /okay
> ****************************
>
> --
> Steven Samuels
> [email protected]
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax: 206-202-4783
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
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