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Re: st: Just and Pope Production model-What are the commands?


From   Kelvin Mulungu <kelvin.statalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Just and Pope Production model-What are the commands?
Date   Wed, 12 Jun 2013 21:52:43 +0300

Scott,

Thank you so much. The procedure is very clear and you have explained
it well. I actually have the paper by Belotti and others and I have
been in touch with Silvio Daidone. I have since installed sfpanel. My
idea is to estimate using both approaches and compare the results.

Thank you.

On Wed, Jun 12, 2013 at 6:13 PM, Scott Merryman
<scott.merryman@gmail.com> wrote:
> The general form of the Just and Pope production function is the
> regress yield on a set of explanatory variables.  Then regress the log
> of the squared residuals on the set of explanatory variables.  And
> then use the predicted values from the second regression as weights in
> first regression.
>
> You might want to take a look at -sfpanel-  by Federico Belotti,
> Silvio Daidone, Giuseppe Ilardi, and Vincenzo Atella (-ssc desc
> sfpanel-).  Several of the models allow for explanatory variables for
> the inefficiency variance function and the  idiosyncratic error
> variance function
>
> Scott
>
>
> On Sun, Jun 9, 2013 at 12:08 PM, Kelvin Mulungu
> <kelvin.statalist@gmail.com> wrote:
>> Sorry for the less informative question.
>>
>> The Just and Pope (Just, R. E and R. D. Pope (1978). Stochastic
>> Specification of Production Function and Economic Implications.
>> Journal of Econometrics, 7(1978): 67-76) model am applying follows
>> closely with that which was used in Cabas et al 2010 (Cabas, J., A.
>> Weersink, and E. Olale (2010). Crop yield response to economic, site
>> and climatic variables. Climatic Change, 101:599–616) or by Isik and
>> Devadoss (Isik, M., and S. Devadoss (2006). An Analysis of the Impact
>> of Climate Change on Crop Yields and Yield Variability. Applied
>> Economics, 38:835-844.).
>>
>> This production function allows the effect of an input or
>> environmental factor to have a different effect on yield and the
>> variability of yield as measured by the standard deviation. In the
>> second stage, it is the standard deviation of yield which is used as
>> the dependent variable to measure the effect on yield variability
>> while the first stage has just yield as the dependent. Am applying it
>> to a 31 year panel which is unbalanced.
>>
>> Thanks.
>>
>> On Sun, Jun 9, 2013 at 7:30 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>> will already know about the Just and Pope model,  but 50 or 500 might
>>> be interested in estimating production functions.
>>>
>>> Statalist is not primarily a way to get personal help in public; it is
>>> about building a forum of questions and answers that may be useful to
>>> as many people as possible.
>>>
>>> In short, please add helpful references and/or links to maximise the
>>> information here.
>>>
>>> Nick
>>> njcoxstata@gmail.com
>>>
>>> On 9 June 2013 17:21, Kelvin Mulungu <kelvin.statalist@gmail.com> wrote:
>>>>
>>>> Am supposed to use both the linear and Cobb-Douglas forms of the Just
>>>> and Pope production function model to check influence of climate on
>>>> crop yields, but am not able to find the commands. My data is panel
>>>> and unbalanced. I would like to try both fixed and random effects.
>>>>
>>>> And also how to generate the dependent variable for the second stage,
>>>> that is the standard deviation of yield.
>>> *
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>>> *   http://www.ats.ucla.edu/stat/stata/
>>
>>
>>
>> --
>> Kelvin
>> kelvin.statalist@gmaill.com
>>
>> *
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>
> *
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-- 
Kelvin
kelvin.statalist@gmaill.com

*
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