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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Dropping Variables - Simple Question |

Date |
Mon, 13 Aug 2007 10:30:29 -0400 |

Tiago, There have been several answers to your question. If I understand correctly, you want to keep all 75 observations. The solution is therefore not to -drop- any observations but to replace Y by missing values. replace Y = . if X == . On the other hand, perhaps your variables are sorted in a certain way and you want to delete the contents of the first 25 observations of Y. Again, the solution uses -replace-. replace Y = . if _n < 26 Or perhaps your dataset is sorted such that the first 25 observations have missing values in X and you want to remove those observations from the dataset. In that case you would indeed use -drop-. drop if _n < 26 To summarize, it is not clear what exactly you are trying to accomplish. Friedrich On 8/12/07, tiago.pereira@incor.usp.br <tiago.pereira@incor.usp.br> wrote: > Dear statalisters, > > I have a simple question: > > Supose I have two variables, X and Y with 50 and 75 observations, > respectively. How do I delete the first 25 observations of the variable Y > without losing the first 25 observations of the X variable? > > Although simple, I have not been able to find out a solution. > > Thank you again. > > Best regards, > > Tiago * * 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**:**st: Dropping Variables - Simple Question***From:*tiago.pereira@incor.usp.br

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