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From |
Fernando Luco <flucoestatalist@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Wed, 2 Nov 2011 16:30:53 -0500 |

Thanks for quick response Austin. It was just what I was trying to do. On Wed, Nov 2, 2011 at 4:22 PM, Austin Nichols <austinnichols@gmail.com> wrote: > Fernando Luco <flucoestatalist@gmail.com> : > > clear > input group y x > 1 1 10 > 1 2 10 > 1 2 10 > 2 3 8 > 2 1 8 > end > g obs=_n > bys group x: g e=1+(_N==_n) > expand e > bys group x (obs): replace y=. if _n==_N > by group x: g sumy=sum(y) > replace y=x-sumy if mi(y) > list, sepby(group) > > > On Wed, Nov 2, 2011 at 5:13 PM, Fernando Luco <flucoestatalist@gmail.com> wrote: >> Dear all, >> >> 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/ > * * 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: Insert new observation by group***From:*Nick Cox <njcoxstata@gmail.com>

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

**Re: st: Insert new observation by group***From:*Austin Nichols <austinnichols@gmail.com>

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