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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. >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >> >> >> >> -- >> Kelvin >> kelvin.statalist@gmaill.com >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- Kelvin kelvin.statalist@gmaill.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Just and Pope Production model-What are the commands?***From:*Kelvin Mulungu <kelvin.statalist@gmail.com>

**Re: st: Just and Pope Production model-What are the commands?***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Just and Pope Production model-What are the commands?***From:*Kelvin Mulungu <kelvin.statalist@gmail.com>

**Re: st: Just and Pope Production model-What are the commands?***From:*Scott Merryman <scott.merryman@gmail.com>

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