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From |
Erik Aadland <erikaadland@hotmail.com> |

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

Subject |
st: creating variable summarizing for each individual properties of other members of a group at t-1 |

Date |
Tue, 17 May 2011 14:09:07 +0000 |

Dear statalist. I need to create a variable that sums for each individual in my dataset the total number of ind_entry of all other individuals at time: yearmonth - 1. I have attached a small ex of my data structure below. So for instance, given the small dataset below, for ind_id 2 in yearmonth 11 this variable score = 1. But for ind_id 4 in the same yearmonth, the score = 0. I would also like to generate a variable that identifies for each individual the unique number of other individuals in the dataset that have experienced ind_entry = 1 at least once up until time: yearmonth - 1. I am familiar with the following FAQ: http://www.stata.com/support/faqs/data/members.html My data structure is snapshot data in principle like the example below, but some individuals enter the observation window later than others (i.e. in later yearmonths): year month yearmonth ind_id ind_entry 2003 10 10 2 0 2003 11 11 2 0 2003 12 12 2 0 2004 1 13 2 0 2004 2 14 2 1 2004 3 15 2 0 2003 10 10 4 1 2003 11 11 4 0 2003 12 12 4 1 2004 1 13 4 0 2004 2 14 4 0 2004 3 15 4 0 Any and all input is very welcome. Kind regards and all the best. Erik Aadland. * * 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: creating variable summarizing for each individual properties of other members of a group at t-1***From:*Jorge Eduardo Pérez Pérez <perez.jorge@ur.edu.co>

**st: RE: creating variable summarizing for each individual properties of other members of a group at t-1***From:*Nick Cox <n.j.cox@durham.ac.uk>

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