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From |
Clinton Thompson <clintonjthompson@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: repeatedly shuffle number sequence |

Date |
Tue, 25 Oct 2011 10:08:10 +0200 |

Hello All, I'm using Stata/SE 11.2 for WIndows. This is a question that is part programming, part efficiency, and part style. Consider a sequence of numbers, say [1,10], that I want to shuffle/randomize several times such that I end up w/ k variables where each of the variables created contains a random shuffling of the values [1,10]. I approached this using a rather simple and rudimentary -foreach- loop: >>>>>>>>>>>>> BEGIN >>>>>>>>>>> clear set obs 10 set seed 20111025 foreach num of numlist 1/5 { gen int seq`num' = _n gen rand`num' = runiform() sort rand`num' drop rand`num' } <<<<<<<<<< END <<<<<<<<<<<<< This approach works -- in the sense that k variables are created where each variable contains a random shuffling of the numbers from 1-10 -- but I'm not sure if this the best way to approach this kind of problem. Does the creation of a -wide- dataset (as in my approach) make the most sense (I'll be expanding this to 20-25 variables instead of the 5 currently programmed)? And I can easily change the sequences of the values for all of the seq* variables depending on which of the rand* variables is sorted but this doesn't seem too robust. Any thoughts or advice on whether this is the best (read: correct and most efficient?) approach to this problem is most appreciated. Many thanks! ~Clint Thompson * * 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: repeatedly shuffle number sequence***From:*Nick Cox <njcoxstata@gmail.com>

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