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From |
Stuart Buck <stuartbuck@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Mon, 29 Apr 2013 13:46:14 -0500 |

Here's what I have: 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). thanks, -- Stuart Buck http://about.me/stuartbuck * * 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>

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