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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Generate random missing values within a set of variables |

Date |
Sun, 15 Apr 2012 15:26:32 +0200 |

On Sun, Apr 15, 2012 at 2:06 PM, Sofia Ramiro wrote: > I have 6 variables (without missings) and I would like to randomly generate one missing value in one of the 6 variables per line/observation. I know that with the runiform command we manage to choose observations randomly within one variable (so I could generate random missing values within one variable), but how can I choose randomly one variable out of the 6 to be transformed into missing and make sure that one of them is being transformed per observation? *---------- begin example ------------ // create some data drop _all set obs 100 forvalues i =1/6{ gen x`i' = rnormal() } // make a variable indicating // which variable will become missing gen tomis = ceil(6*runiform()) // turn for each observation the // appropriate variable to missing forvalues i = 1/6 { replace x`i' = . if tomis == `i' } // see the result format x* %6.3g list in 1/10, clean *------------- end example ------------- Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/

**Follow-Ups**:**RE: st: Generate random missing values within a set of variables***From:*Sofia Ramiro <sofiaramiro@hotmail.com>

**References**:**st: Generate random missing values within a set of variables***From:*Sofia Ramiro <sofiaramiro@hotmail.com>

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