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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: AW: AW: Fun with switching point |

Date |
Thu, 8 Oct 2009 16:16:48 +0100 |

In one of many terminologies, each switching point defines the start of a new spell. Thus in addition, 1. -tsspell- from SSC is a useful tool. The variable desired by Quang Nguyen is just _seq - 1, in terms of variables created automatically by -tsspell-. 2. Independently of that, a fairly detailed discussion of techniques for handling spells was given in SJ-7-2 dm0029 . . . . . . . . . . . . . . Speaking Stata: Identifying spells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q2/07 SJ 7(2):249--265 (no commands) shows how to handle spells with complete control over spell specification By the way, and this is a crucial detail: I am guessing what Martin's code and Quang's example don't respect: that you want to do this separately by identifier. Nick n.j.cox@durham.ac.uk Martin Weiss Also look at the techniques provided by Nick in the FAQ: http://www.stata.com/support/faqs/data/#manip Martin Weiss ************* clear* input byte(id x) 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 1 2 1 end compress gen byte y=0 replace y= /* */ cond(x[_n-1]!=x[_n], 0, /* */ y[_n-1]+1) in 2/l list, noobs ************* Quang Nguyen Suppose, I have the following data: id x 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 1 2 1 .. Now, I would like to generate a variable _y _such that _y_ takes the ordering value of 1, 2, 3... as long as the corresponding _x_ takes the same value as the previous observation. Otherwise, _y_ is 0. Specifically, from the above data, we have: id x y 1 1 1 1 1 1 1 2 1 1 3 1 0 0 1 0 1 1 1 0 1 1 1 2 1 2 .. Can you suggest a way to do this in 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/

**References**:**st: Fun with switching point***From:*Quang Nguyen <quangn@gmail.com>

**st: AW: Fun with switching point***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**st: AW: AW: Fun with switching point***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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