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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How to generate a dummy variable based on groups of variables in t-1 |

Date |
Sat, 30 Apr 2011 11:14:02 +0100 |

That would be my hint too. On the correspondence any <-> max, all <-> min, see (e.g.) FAQ . . Creating variables recording whether any or all possess some char. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox 2/03 How do I create a variable recording whether any members of a group (or all members of a group) possess some characteristic? http://www.stata.com/support/faqs/data/anyall.html Nick On Sat, Apr 30, 2011 at 11:09 AM, Nick Sanders <sandersn@stanford.edu> wrote: > Jean-Marie, > > I think you could do this with a combination of egen and sorting. Say your takeover indicator is firm_takeover. Then: > > egen industry_takeover = max(firm_takeover), by(industry year) > sort firm year > by firm : gen takeover_last = (industry_takeover[_n-1] == 1 > > > That should do it! > -Nick > > On Apr 30, 2011, at 2:50 AM, "Jean-Marie Meier" <jean-marie.meier@web.de> wrote: > >> Dear Stata list, >> >> It would be great if anyone could help me with this issue as I spent hours on it without solving it: >> >> I have a dataset with all companys listed on US stock exchanges from 1979 up to now. >> Every observation in my dataset are balance sheet and profit & loss account data for a given firm in a given year. >> >> I have a dummy variable, which is 1 for an observation if a firm was taken over and left the dataset - e.g. firm ABC was taken over in 1985, then for all observations up to 1984 for this firm the dummy variable is 0 and for the observation in 1985 the dummy variable is 1. If a firm was not taken over, than the dummy variable is obviously always 0. >> >> All firms/observations in my dataset are assigned an industry code between 1 and 48 (Fama French industry classification). >> >> My problem now is: >> >> How do I generate a dummy variable which is 1 for a given firm x and year t if there was a takeover in t-1 in the same industry (same industry code) and which is 0 otherwise ? * * 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: How to generate a dummy variable based on groups of variables in t-1***From:*Austin Nichols <austinnichols@gmail.com>

**References**:**st: How to generate a dummy variable based on groups of variables in t-1***From:*"Jean-Marie Meier" <jean-marie.meier@web.de>

**Re: st: How to generate a dummy variable based on groups of variables in t-1***From:*Nick Sanders <sandersn@stanford.edu>

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