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Re: st: Question about scalars
From
Steve Samuels <[email protected]>
To
[email protected]
Subject
Re: st: Question about scalars
Date
Mon, 9 Aug 2010 15:56:09 -0400
Thanks, Austin.
Steve
On Mon, Aug 9, 2010 at 3:51 PM, Austin Nichols <[email protected]> wrote:
> Steve et al.:
>
> d is an abbrev for displacement, and the first obs is 121.
> Use scalar(d) instead.
>
> On Mon, Aug 9, 2010 at 3:26 PM, Jeph Herrin <[email protected]> wrote:
>> Yes, but look closely at
>>
>>> . scalar e = d + a
>>> . scalar dir a d e // "e" is wrong
>>> a = 10
>>> d = 4.9458042
>>> e = 131
>>
>> You'll see that 4.94+10 = 131. Which is incorrect.
>>
>> cheers,
>> Jeph
>>
>> On 8/9/2010 2:15 PM, Sergiy Radyakin wrote:
>>>
>>> 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
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>
--
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/