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From |
natasha agarwal <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Programming Stata |

Date |
Wed, 17 Aug 2011 14:57:44 +0100 |

Below is the summary statistics for meap92_01.dta in the zip file . xtdescribe distid: 1010, 2070, ..., 83070 n = 501 year: 1992, 1993, ..., 2001 T = 10 Delta(year) = 1 unit Span(year) = 10 periods (distid*year uniquely identifies each observation) Distribution of T_i: min 5% 25% 50% 75% 95% max 10 10 10 10 10 10 10 Freq. Percent Cum. | Pattern ---------------------------+------------ 501 100.00 100.00 | 1111111111 ---------------------------+------------ 501 100.00 | XXXXXXXXXX Both are strongly balanced! William Greene in his book with David Hensher on 'Modelling Ordered Choices' state "Wooldridge proposes that αi be projected on all T vectors, xit rather than on just the means. The practical problem with this approach shows up in our application, in which there is an unbalanced panel. Simply filling in the missing years with zeros is not a satisfactory solution; zero is not an appropraite value for the regressor vector in a given year.)" Natasha On Wed, Aug 17, 2011 at 2:52 PM, natasha agarwal <[email protected]> wrote: > In addition, > > This is the summary statistics for lfp.dta in the zip file link > > > > id: 1, 2, ..., 5663 n = 5663 > period: 1, 2, ..., 5 T = 5 > Delta(period) = 1 unit > Span(period) = 5 periods > (id*period uniquely identifies each observation) > > Distribution of T_i: min 5% 25% 50% 75% 95% max > 5 5 5 5 5 5 5 > > Freq. Percent Cum. | Pattern > ---------------------------+--------- > 5663 100.00 100.00 | 11111 > ---------------------------+--------- > 5663 100.00 | XXXXX > > And below is the summary statistics for meap > > On Wed, Aug 17, 2011 at 2:45 PM, natasha agarwal > <[email protected]> wrote: >> Yes! >> >> Search for 'unbalanced' in the link below >> >> http://www.cemmap.ac.uk/resources/imbens_wooldridge/lecture_6.pdf >> >> Natasha >> >> >> >> On Wed, Aug 17, 2011 at 1:12 PM, Austin Nichols <[email protected]> wrote: >>> natasha agarwal <[email protected]> >>> Seriously? >>> Search for "balanced" in the first link provided: >>> http://stata.com/meeting/chicago11/materials/chi11_wooldridge.pdf >>> >>> On Wed, Aug 17, 2011 at 5:57 AM, natasha agarwal >>> <[email protected]> wrote: >>>> Hi Austin, >>>> >>>> You are absolutely right. This has got to do with Woolridge's APE stuff. >>>> >>>> I had a look at the links you posted (thanks for that) and it has got >>>> me a little confused. >>>> >>>> Is the APE calculation meant only for balanced panel (as his data is balanced)? >>>> >>>> Thanks >>>> Natasha >>>> >>>> >>>> >>>> On Tue, Aug 16, 2011 at 3:57 PM, Austin Nichols <[email protected]> wrote: >>>>> natasha agarwal <[email protected]>: >>>>> I am guessing this is related to Wooldridge's APE stuff: >>>>> http://stata.com/meeting/chicago11/materials/chi11_wooldridge.pdf >>>>> http://ideas.repec.org/p/boc/nsug08/17.html >>>>> http://stata.com/meeting/snasug08/abstracts.html#wooldridge >>>>> >>>>> I have some programs from 2007 or 2008 to calculate the APE, but I >>>>> never released them, as I was working on a large-grain parallelized >>>>> bootstrap to speed up the SE calculations that I never finished. I >>>>> guess I should revisit those programs, since there seems to be an >>>>> ongoing demand, but there is more than enough Stata code in >>>>> Wooldridge's presentations to help you write your own program for a >>>>> specific application. >>>>> >>>>> One thing--in your program below you put -xb- as an option to -gen- >>>>> when you mean -predict-. Whenever you write a -program-, start by >>>>> running the commands interactively first, to debug your code. >>>>> >>>>> On Tue, Aug 16, 2011 at 10:17 AM, Nick Cox <[email protected]> wrote: >>>>>> In addition to Neil's comments, >>>>>> >>>>>> 1. There is no obvious gain from writing this as a program. >>>>>> You might as well just run these commands in a do-file. Of course, this may be under development. >>>>>> >>>>>> 2. The line >>>>>> >>>>>> xtprobit expdum 'x', re >>>>>> >>>>>> will not work as the same character ' is used for both delimiters. You need >>>>>> >>>>>> xtprobit expdum `x', re >>>>>> >>>>>> Nick >>>>>> [email protected] >>>>>> >>>>>> Neil Shephard >>>>>> >>>>>> If you are going to write it as a program then you should save it as >>>>>> [filename].ado (not [filename].do as you are implying) and place it in >>>>>> one of your systems -adopath-'s (to see what these are simply type >>>>>> -adopath- in Stata. >>>>>> >>>>>> See [U] 16-18 for greater details on "Do-Files" (Chapter 16) >>>>>> "Ado-Files (Chapter 17) and "Programming Stata (Chapter 18). >>>>>> >>>>>> On 16 August 2011 13:41, natasha agarwal <[email protected]> wrote: >>>>>> >>>>>>> I am trying to write and run a program in Stata. The program I define >>>>>>> is as follows and I save it in the do-file >>>>>>> >>>>>>> capture program drop fdi >>>>>>> program fdi, rclass >>>>>>> local x " lnvfdi mfdi" >>>>>>> xtprobit expdum 'x', re >>>>>>> gen double x1b1hat, xb >>>>>>> gen double scale = normalden(x1bhat1) >>>>>>> gen double pe1=scale*_b[lnvfdi] >>>>>>> summarize pe1, meanonly >>>>>>> return scalar ape1=r(mean) >>>>>>> drop x1b1hat scale pe1 >>>>>>> end >>>>>>> >>>>>>> When I type fdi, I get an error invalid file name. >>>>>>> >>>>>>> Can anyone please help me? >>> >>> * >>> * 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/ >>> >> > * * 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/

**Follow-Ups**:**Re: st: Programming Stata***From:*natasha agarwal <[email protected]>

**References**:**st: Programming Stata***From:*natasha agarwal <[email protected]>

**Re: st: Programming Stata***From:*Neil Shephard <[email protected]>

**RE: st: Programming Stata***From:*Nick Cox <[email protected]>

**Re: st: Programming Stata***From:*Austin Nichols <[email protected]>

**Re: st: Programming Stata***From:*natasha agarwal <[email protected]>

**Re: st: Programming Stata***From:*Austin Nichols <[email protected]>

**Re: st: Programming Stata***From:*natasha agarwal <[email protected]>

**Re: st: Programming Stata***From:*natasha agarwal <[email protected]>

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