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From |
"Sergiy Radyakin" <serjradyakin@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: identifying a string of consecutive numbers |

Date |
Wed, 16 Apr 2008 12:35:37 -0400 |

I guess Nick's solution will give a false-positive in observation C (which also has a pattern 100), but not identify observation A, which ends in one 0 following a 1. I interpret the question as "how to identify observations ending in 0-spell after 1-spell". Here is how: input str5 years "11110" "11100" "11001" "10111" "00001" "00000" end gen indicator=strpos(strreverse(years),"0")>strpos(strreverse(years),"1") & strpos(years,"1")>0 list //----------------------------------------------------------------- the code requires at least one occurance of 1-spell, if this is not necessary, remove "& strpos(years,"1")>0". Best regards, Sergiy Radyakin On 4/16/08, Nick Cox <n.j.cox@durham.ac.uk> wrote: > I don't understand what differentiates A and B from the other three, > but you can concatenate all and then search for patterns. > > . egen all = concat(yr?) > . l if strpos(all, "100") > > Nick > n.j.cox@durham.ac.uk > > Jon Schwabish > > I'm hoping someone can help me with this b/c I'm > totally stumped. I have a wide data set and am trying > to identify observations that have a series of > consecutive zeros following any positive number. > > For example, say I have 5 years of data and the > following information for 5 observations: > > ObsA 1 1 1 1 0 > ObsB 1 1 1 0 0 > ObsC 1 1 0 0 1 > ObsD 1 0 1 1 1 > ObsE 0 0 0 0 1 > > The variable names are something like yr1, yr2, yr3, > yr4, yr5. I would like to create a variable that > differentiates ObsA and ObsB from the other three. > > > * > * 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/ > * * 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/

**Follow-Ups**:**RE: st: RE: identifying a string of consecutive numbers***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: identifying a string of consecutive numbers***From:*Jon Schwabish <jschwabi@yahoo.com>

**st: RE: identifying a string of consecutive numbers***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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