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From |
"Friedrich Huebler" <fhuebler@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: counting the number of times a string appears in a string variable? |

Date |
Wed, 5 Nov 2008 01:14:36 -0500 |

Mingfeng, Do your strings always look as in your example? Here is one solution to your problem. clear set obs 1 gen x = "johnabc johncd" split x forval i = 1/2 { gen john`i' = regexm(x`i',"john") } egen y = rowtotal(john1 john2) list, noobs +-------------------------------------------------------+ | x x1 x2 john1 john2 y | |-------------------------------------------------------| | johnabc johncd johnabc johncd 1 1 2 | +-------------------------------------------------------+ Friedrich On Tue, Nov 4, 2008 at 9:42 PM, Mingfeng Lin <mingfeng.lin@gmail.com> wrote: > Greetings, > > I looked through the list of string functions but couldn't find one > that fits the bill. Suppose I have a string variable X, and I would > like to generate a new numeric variable Y containing the number of > times a certain string appeared in X. For instance > > X = "johnabc johncd" > > If I'd like to find the number of times "john" shows up in X, I hope to obtain > Y = 2 > > Is there a function in Stata to do this? > > Thank you very much for your help! > > Mingfeng * * 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: counting the number of times a string appears in a string variable?***From:*"Mingfeng Lin" <mingfeng.lin@gmail.com>

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