Re: st: problems with levpet command

[Nick Cox <njcoxstata@gmail.com>]

You should only remove zeros with good reason, and you have not given one.

On this evidence, you really do have missings, despite your denial.
Show us the results of

. summarize lnrva lnl lnrm lnrk id year

Nick
njcoxstata@gmail.com


On 28 January 2014 10:40, Skrinjaric Bruno <bskrinjaric@eizg.hr> wrote:
> . d id year
>
> variable storage   display    value
> name          type    format     label      variable label
> ------------------------------------------------------------------------
> --------
> id                 long    %10.0g                     id of the firm
> year              int     %9.0g                        year
>
>
> . destring id year,replace
>
> id already numeric; no replace
> year already numeric; no replace
>
> No, that's still not it. I have removed zero values in hope of resolving
> this problem, but it didn't work.
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Tuesday, January 28, 2014 11:21 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: problems with levpet command
>
> You've not told us about -id- and -year-. -levpet- requires a numeric
> panel identifier.
>
> If -id- is string, then use -encode-.
>
> (Removing zero values: why did you do that?)
>
> Nick
> njcoxstata@gmail.com
>
>
> On 28 January 2014 09:59, Skrinjaric Bruno <bskrinjaric@eizg.hr> wrote:
>> Thanks for quick reply. When I do -describe- this is what I get...
>>
>> . describe lnrva lnl lnrm lnrk
>>
>> variable storage   display    value
>>    name     type       format     label      variable label
>> ----------------------------------------------------------------------
>> --
>> --------
>> lnrva           float      %9.0g                               Ln of
>> Real VA, deflated by
>>
>> sectoral deflator
>> lnl                 float      %9.0g                            Ln of
>> labour
>> lnrm            float      %9.0g                                Ln of
>> Real material costs,
>>
>> deflated by GDP deflator
>> lnrk              float      %9.0g                              Ln of
>> Real capital stock, deflated
>>                                                                  by
>> GDP deflator
>>
>>
>> Even if I try to destring it, it says they are already numeric...
>>
>> . destring lnrva lnl lnrm lnrk, replace force lnrva already numeric;
>> no replace lnl already numeric; no replace lnrm already numeric; no
>> replace lnrk already numeric; no replace
>>
>> I still do not know what to do.
>>
>>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu
>> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
>> Sent: Tuesday, January 28, 2014 10:38 AM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: Re: st: problems with levpet command
>>
>> This often means that some variable that should be numeric is really
>> string. Look carefully at the results of -describe- on the variables
>> you are using and try using -destring-.
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 28 January 2014 09:31, Skrinjaric Bruno <bskrinjaric@eizg.hr>
> wrote:
>>
>>> I have only recently started using Stata and I came across a project
>>> where I have to use levpet command. I have downloaded st060 (SJ-4-2)
>>> and installed it.
>>>
>>> I want to use the following command:
>>>
>>> . levpet lnrva, free(lnl) proxy(lnrm) capital(lnrk) i(id) t(year)
>>> valueadded
>>>
>>> However I always get to following error:
>>>
>>> no observations
>>> r(2000);
>>>
>>> I am very sure I have all the observations for the variables I am
>> using.
>>> I am doing this for every sector according to NACE 1-digit
>>> classification and the number of observations ranges from 25 - 1125
>>> across different sectors.
>>> But I removed all missing values, and also all zero values. All
>>> variables are in float format.
>>>
>>> I have also read the help file, but I cannot find the solution to my
>>> problem.
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