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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How to identify two consequtives values of a variable |

Date |
Fri, 22 Jul 2011 13:12:41 -0500 |

. gen previous = x[_n-1] if abs(x[_n-1]) . replace previous = previous[_n-1] if missing(previous) . gen y = x == 1 & previous ==1 Nick On Fri, Jul 22, 2011 at 12:06 PM, Pablo.CARVALLO <pablocepal@gmail.com> wrote: > Hi Statalist, > > I create a variable x which states a local max (1), a local min(-1), > and 0 in other case. If x==1, the following value may be 0 or -1, but > it cannot be 1 again. For example, an 'ideal' x may be: > > x > -- > 0 > 0 > 1 > 0 > 0 > 0 > 0 > -1 > 0 > 0 > 1 > -1 > 0 > 0 > 0 > 1 > > But I have something like this: > > x > -- > 0 > 0 > 1 > 0 > 0 > 0 > 0 > 1 ----> this value is wrong, because previous x different from 0 was 1. > 0 > 0 > -1 > 1 > 0 > 0 > 0 > -1 > > I need a variable 'y' which tells me when x takes this wrong values: > > x y > --------- > 0 0 > 0 0 > 1 0 > 0 0 > 0 0 > 0 0 > 0 0 > 1 1 ---> y==1 > 0 0 > 0 0 > -1 0 > 1 0 > 0 0 > 0 0 > 0 0 > -1 0 > * * 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 identify two consequtives values of a variable***From:*"Pablo.CARVALLO" <pablocepal@gmail.com>

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