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From |
"Sarah Edgington" <sedging@ucla.edu> |

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

Subject |
RE: st: using loop for [_n+1] |

Date |
Thu, 15 Nov 2012 08:32:20 -0800 |

I don't think you need a loop for what you want to do. It seems like what you want is: gen money=mone+mone[_n+1] if v1==v1[_n+1] & v2==v2[_n+1] & v3==v3[_n+1] ... & v10==v10[_n+1] (where the ellipsis represents the equalities for v4-v9 that I am too lazy to write out at the moment) You don't need a loop for that. You just need to write out the whole if statement. As an aside, even changing the = to == should not have fixed your original example because you still have a -gen- command that repeats each time the loop is iterated. Stata can't generate a new variable if it already exists (which in your example it would since money is generated inside the loop). -Sarah -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Dherani, Mukesh Sent: Thursday, November 15, 2012 3:22 AM To: statalist@hsphsun2.harvard.edu Subject: RE: st: using loop for [_n+1] Thanks Martin, it does run without any complaints. However, it does not provide the required. It compares each variable of next row as 'or' rather than 'and'. I wanted to compare two rows and if they are exactly the same then it should add money in the preceding row. Using this syntax it is adding money even only one variable is equal in value in the next row. Secondly, I wanted to assess which two rows are exactly the same using following command: foreach x of varlist v1-v10 { sort v1 v2,stable gen num=1 if `x'==`x'[_n+1] | `x'==`x'[_n-1] } this keep running the loop, error : num already defined. thanks again. m * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: using loop for [_n+1]***From:*"Dherani, Mukesh" <M.K.Dherani@liverpool.ac.uk>

**Re: st: using loop for [_n+1]***From:*Maarten Buis <maartenlbuis@gmail.com>

**RE: st: using loop for [_n+1]***From:*"Dherani, Mukesh" <M.K.Dherani@liverpool.ac.uk>

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