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Re: st: problems with levpet command
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: problems with levpet command
Date
Wed, 29 Jan 2014 09:40:21 +0000
<>
Thanks for closing the thread here.
Nick
[email protected]
On 29 January 2014 08:10, Skrinjaric Bruno <[email protected]> wrote:
> OK. I think I got it. Apparently, the problem was that I have panel data
> with gaps in time variable, i.e. I have data for years 2008, 2010 and
> 2012.
> I -recode-d variable year to be without gaps, and then -levpet- works.
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Nick Cox
> Sent: Tuesday, January 28, 2014 12:27 PM
> To: [email protected]
> Subject: Re: st: problems with levpet command
>
> OK. I think now that your problem must be something specific to
> -levpet-. I am out of advice because I've never used it and don't know
> anything about its precise assumptions, but
>
> . set trace on
>
> before -levpet- would show where the program fails. If you show the
> results, someone may be able to give advice.
>
>
> Nick
> [email protected]
>
>
> On 28 January 2014 11:19, Skrinjaric Bruno <[email protected]> wrote:
>> Here it is...
>>
>> . summarize lnrva lnl lnrm lnrk id year
>>
>> Variable | Obs Mean Std. Dev. Min Max
>> -------------+--------------------------------------------------------
>> lnrva | 1047 17,20429 2,074527 8,822554 23,24413
>> lnl | 1047 4,766175 1,732232 0 9,194313
>> lnrm | 1047 17,24891 2,236354 8,082948 23,6598
>> lnrk | 1047 16,8549 2,405058 7,859804 23,52634
>> id | 1047 2549185 1011692 154288 3964248
>> -------------+--------------------------------------------------------
>> year | 1047 2009,975 1,627722 2008 2012
>>
>>
>> -----Original Message-----
>> From: [email protected]
>> [mailto:[email protected]] On Behalf Of Nick Cox
>> Sent: Tuesday, January 28, 2014 11:52 AM
>> To: [email protected]
>> Subject: Re: st: problems with levpet command
>>
>> 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
>> [email protected]
>>
>>
>> On 28 January 2014 10:40, Skrinjaric Bruno <[email protected]>
> 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: [email protected]
>>> [mailto:[email protected]] On Behalf Of Nick Cox
>>> Sent: Tuesday, January 28, 2014 11:21 AM
>>> To: [email protected]
>>> 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
>>> [email protected]
>>>
>>>
>>> On 28 January 2014 09:59, Skrinjaric Bruno <[email protected]>
>> 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: [email protected]
>>>> [mailto:[email protected]] On Behalf Of Nick Cox
>>>> Sent: Tuesday, January 28, 2014 10:38 AM
>>>> To: [email protected]
>>>> 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
>>>> [email protected]
>>>>
>>>>
>>>> On 28 January 2014 09:31, Skrinjaric Bruno <[email protected]>
>>> 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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