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From |
Austin Nichols <austinnichols@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 07:22:32 -0400 |

Except use a lag operator (help tsvarlist), or first ensure there are no gaps in panels. egen industry_takeover = max(firm_takeover), by(industry year) tsset firm year gen takeover_last =L.industry_takeover On Sat, Apr 30, 2011 at 6:14 AM, Nick Cox <njcoxstata@gmail.com> wrote: > 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/

**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>

**Re: st: How to generate a dummy variable based on groups of variables in t-1***From:*Nick Cox <njcoxstata@gmail.com>

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