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

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

Subject |
RE: st: let loop stop when the first variable x becomes 0 |

Date |
Fri, 20 Jun 2008 13:22:03 +0100 |

Keith's answer is in essence identical to mine. But to me such a solution is still less than ideal. You would be much better off, I guess, reshaping your data to long. That will make most things you might want to do with such data much easier. reshape long x, i(ID) j(year) bysort ID (x year) : gen firstzero = year if x[1] == 0 If you really want the present data structure, you can reshape wide to get it back. Nick n.j.cox@durham.ac.uk Man Jia Thanks very much for your help! It works well. I appreciate it. Keith Dear >>You could do it like this: >> >>gen int firstzero=. >>forval y=1995/2002 { >> replace firstzero=`y' if firstzero==. & x`y'==0 >>} >>>I have a data set like this: >>>------------------------------------------------------------------- >>>ID,x1995, x1996, x1997, x1998, x1999, x2000, x2001, x2002 >>> >>> 1 1 0 1 1 0 1 0 >>> 0 >>> 2 0 0 0 0 1 0 0 >>> 0 >>> 3 1 1 0 1 0 0 0 >>> 0 >>>--------------------------------------------------------------------- >>>I want to find out for each observation the first year when the value >>>of the variable x becomes 0. >>> >>>For example, for observation 1, the first year x becomes 0 is 1996. For >>>observation 2 and 3, 1995 and 1997 respectively. >>> >>>I'm not sure how to let the "searching the first 0" loop stop when x >>>becomes 0. I checked STATA's help; I was wondering if the command >>>"continue" will work here. Could someone give me some hints about this? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: let loop stop when the first variable x becomes 0***From:*Man Jia <jia.m@neu.edu>

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