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From |
Nick Cox <njcoxstata@gmail.com> |

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

Subject |
Re: st: How to generate lags where each variable to be lagged has multiple values in the previous time periods |

Date |
Mon, 29 Apr 2013 20:32:47 +0100 |

Focus on any cohort, say the cohort that was grade 8 in 2011, grade 7 in 2010 and so forth. Evidently, the difference (year - grade) is constant, and therefore an identifier, for that cohort. Thus after gen id = year - grade either tsset id year or tsset id grade defines a panel dataset with an identifier and a time variable and time series operators can then be applied. Nick njcoxstata@gmail.com On 29 April 2013 19:46, Stuart Buck <stuartbuck@gmail.com> wrote: > Passage rates for all Texas schools for 2008, 2009, 2010, and 2011 -- > this is important -- by grade. So each row in the dataset is School, > Year, Grade, and then scores (plus other demographic variables, etc.). > > In other words, the dataset looks like this: > > Year SchoolID Grade TestScore > 2011 1 6 *** > 2011 1 7 *** > 2011 1 8 *** > > And so on and so forth -- multiple grades in each school in each year. > > Here's what I want: > > To be able to regress any given school's performance in Grade X in > Year T on, among other things, how that same school did with the same > cohort of kids in the previous grade (Grade X-1) in the previous year > (Year T-1). I.e., if a middle school's Grade 8 passage rate in 2011 is > the outcome, I'd like to be able to control for that same school's > Grade 7 passage rate in 2010, thus giving a somewhat crude measure of > how much that group of kids progressed since the previous year. > > How would I generate an all-purpose lagged TestScore variable for all > the schools in the dataset, lagging by both year and grade at once? > All the Stata instructional material I see on lagged variables just > lags based on time, not on both time and some other variable too > (grade). * * 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/

**Follow-Ups**:**Re: st: How to generate lags where each variable to be lagged has multiple values in the previous time periods***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: How to generate lags where each variable to be lagged has multiple values in the previous time periods***From:*Sergiy Radyakin <serjradyakin@gmail.com>

**References**:**st: How to generate lags where each variable to be lagged has multiple values in the previous time periods***From:*Stuart Buck <stuartbuck@gmail.com>

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