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From |
Tim Wade <wadetj@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Need help with -collapse- or a better solution |

Date |
Sat, 1 May 2010 09:57:10 -0400 |

Not sure this is exactly what yo uare looking for but maybe something like: input id year score 1 1 10 1 2 10 1 3 10 1 4 11 1 5 11 1 6 20 2 1 5 2 2 6 2 3 7 2 4 7 qui bysort id (year): gen diff=score-score[_n-1] then you can keep observations with no change (diff=0) Tim On Fri, Apr 30, 2010 at 11:36 PM, Reifschneider Harry III <reifschneiderh3@gmail.com> wrote: > Statalisters, > > Stata/IC 10.1 for Macintosh > Born 01 Oct 2009 > > I need help with -collapse-. I am a grad student and thus just learning this > software (and this is my first post), so please be gentle! > > I have 8 years of data which are broken out into 1 year snapshots, so 8 > observations max for each person. I need to find a "change" in a test score > (afqtscore for this example, but there are 5 total). Not all the > observations have a change and thus I am only concerned with those that do > change. The -help collapse- command talks about percentiles, means, etc., > but I need the actual change, e.g. years 1-4 score is 50 and in year 5 the > score changed to 60 and then remains that way for the duration of the > sample. I am looking at the probability of an increase/decrease in the score > and the magnitude of change and need to know if there is a change and also > the amount. Further more, I am only interested in the demographics (gender, > age,marital status, etc.) at the time of the "updated" or newer score. Same > thing goes for "civilianeduclevelcode1" . Can someone show me an example of > the code to write to get at this requirement? If my description of the > problem is lacking, I am sorry and can try better. Thanks and have a great > weekend! > > seqnumber is the "snapshot" of the fiscal year > > uniqID afqtscore seqnumber primarymos > maritalstatuscode civilianeduclevelcode1 > A17082 42 199 9900 > S 12 > A17082 42 211 341 > M 12 > A17082 48 223 341 > M 12 > A17082 48 235 341 > M 12 > A17082 79 247 341 > M 14 > * > * 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/

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