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From |
mzhang@nd.edu |

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: RE: how to use lag function to create sequential number |

Date |
Sun, 11 Sep 2005 14:10:25 -0500 |

if I use the command egen id = seq(), the id will be a sequential number from 1 to 29 without telling the internal group difference. What I tried to do to get a sequential variable like 1 2 ..........17 1.......5 1 2 3.....7 instead of 1 2 3..............29. Quoting Nick Cox <n.j.cox@durham.ac.uk>: > This has the solution I gave previously. Do try it. > > Nick > n.j.cox@durham.ac.uk > > mzhang@nd.edu > > > Sorry I did not state my question well. there are different > > racial groups in my > > sample. What i want to do is to give each racial group a > > sequential number. > > for example, I have 17 whites, 5 blacks and 7 others. then > > the value of the > > sequential variable I created would be: 1 2 3....17 for > > whites; 1 2 ...5 for > > blacks; > > 1 2 ....7 for others. what I was originally thinking is: > > > > gen sequence=1 > > replace sequcence=sequence+1 if l.race==race > > > > However, this does not work out as I thought. > > Nick Cox > > > > I am not aware of a lag function, i.e. -lag()-, in Stata. There is > > > a lag operator L. but that is not appropriate for your purpose. > > > > > > You may be in search of > > > > > > bysort race : gen id = _n > > > > > > or > > > > > > bysort race : egen id = seq() > > > > > > although note that the labelling produced is essentially arbitrary > > > in either case. > > mzhang@nd.edu > > > > > for example, there are 17 people who have the same ethnicity. > > > > If I want to give > > > > them a sequential number 1 2 3..........17, how can I use lag > > > > function to do this? > > * > * 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/ > * * 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/

**Follow-Ups**:**RE: st: RE: how to use lag function to create sequential number***From:*Sylvain Friederich <ecsjf@yahoo.co.uk>

**References**:**RE: st: RE: how to use lag function to create sequential number***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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