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

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

Subject |
st: RE: Insert new observation by group |

Date |
Wed, 2 Nov 2011 21:25:03 +0000 |

I don't understand all your requirements. I have 1 + 2 + 2 = 5 (not 6) for group 1 and similarly get a different sum for group 2. Also, you don't explain where -ingap- comes from. The bit you may be missing most is -expand-. This may give you a start. bysort group : gen order = _n by group: gen last = _n == _N expand 2 if last bysort group (order) : replace y = <whatever> if _n == _N by group : replace x = <something else> if _n == _N Nick n.j.cox@durham.ac.uk Fernando Luco I'm trying to create a new observation for each group in my data, but I haven't been able to do so. I tried using -ingap- but didn't work because it inserts the new observation at the top of the group or after the first observation. My data looks as follows: group y x 1 1 10 1 2 10 1 2 10 2 3 8 2 1 8 What I want is to insert a new observation at the end of each group, and this observation must be the difference between "x" (in my case this is 10 for group one and 8 for group two) and the sum of "y" (6 for group one and 3 for group two). So, the idea is that the final dataset should look as follows group y x 1 1 10 1 2 10 1 2 10 1 5 10 2 3 8 2 1 8 2 4 8 Any ideas? Thanks, Fernando * * 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/

**Follow-Ups**:**Re: st: RE: Insert new observation by group***From:*Fernando Luco <flucoestatalist@gmail.com>

**References**:**st: Insert new observation by group***From:*Fernando Luco <flucoestatalist@gmail.com>

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