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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Re: assistance writing a loop to create a panel dataset |

Date |
Mon, 14 Nov 2005 10:23:14 -0000 |

I also posted code as a start on your problem. Nick n.j.cox@durham.ac.uk tony fong > Nick mentioned that I should show the code I've been working > on to change my > dataset into panel data, but I haven't been able to put > anything together > worth showing as I'm new to writing code (so I'm still at > square one). > Below I also try to repost the example of what my data > currrently looks > like, as it was kind of tough to read in the last email. If > anyone could > assist me it'd be greatly appreciated. > Thanks! > > id sch1 sch2 start1 end1 start2 end2 > 1 73 . 199308 200000 . . > 2 46 . 199307 199506 . . > 3 12 16 199308 199505 199508 199606 > 4 94 58 199408 199412 199501 199606 > 5 24 . 199608 199706 . . > 6 84 43 199308 199605 199608 199611 > 7 16 . 199508 200000 . . > 8 59 87 199309 199406 199609 200000 > > > where sch1 and sch2 represent the school ID that the teacher > was teaching at > for the respective teaching spells 1 and 2, and start1-end2 > represent the > start and end dates of spells 1 and 2, where the first four > digits is the > year and the last two digits is the month of that year > (actually my data has > five possible start and end date spells, but it got too messy > in pasting the > info above). If the end date is 200000, then the teacher > remained at that > school until the data was right-censored in 1998. I've > cleaned the data so > that all of the spells are in order and none of them overlap > (although there > are gaps of time between some teaching spells). What I'm > trying to do is > create a panel data set in long format, with one observation > for each year > from 1992 until 1997 for every individual. It would give the > school that the > individual taught at for each year (where for the year 1995, > for instance, > it would correspond to the school number that the teacher > taught at for any > of the months from 199507 through 199606, inclusive), or it'd > be a missing > value if the teacher did not teach during that year since > some teachers > started later and many teachers quit after only a year or > two. I've tried to > create a set of loops that loops through each consecutive > non-missing spell > to fill in the variables school92-school97 (which represent > the school > taught at for each year) based on the start and end dates of > each spell, but > I've been unable to do it. Also, some teachers teach at one > school for half > the year and another school for the rest of the year -- in > this case the > first school should count for that particular year. If anyone > can help me > out with the code that would accomplish this task it would be > very much > appreciated. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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