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From |
Eva Poen <eva.poen@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: interval variable to rank variable |

Date |
Fri, 17 Apr 2009 22:28:03 +0100 |

<> Austin, very good catch, thank you. Indeed, a -sort- can do a lot of damage, and I should have left it out. While writing the reply I forgot that, of course, -egen- is clever and will automatically create groups in ascending order of v1, without altering the sort order of the data. Therefore, one line is enought to solve Alexey's problem. Eva 2009/4/17 Austin Nichols <austinnichols@gmail.com>: > Eva-- > Good point--I am so used to using -egen-'s -group()- function for > string variables, that solution did not occur to me. But the prior > -sort- is superfluous, and changing the sort order can be dangerous > for downstream code, when the current sort order contains useful > information (hence my extra lines restoring current sort order). > > On Fri, Apr 17, 2009 at 4:59 PM, Eva Poen <eva.poen@gmail.com> wrote: >> <> >> >> Alexey, >> >> what you want is not technically a rank. -egen, rank- will give you >> ranks, taking all observations into account, and resolving ties. What >> you want can be done with -egen- also: >> >> sort v1 >> egen rank = group(v1) >> >> >> Hope this helps, >> Eva >> >> >> >> 2009/4/17 Alexey Bessudnov <bessudnov@googlemail.com>: >>> Dear all, >>> >>> I have an interval variable v1 with values 1,1,15,15, 47, 47, etc. and I >>> want to recode it into a rank variable v2 so that 1=1, 15=2, 47=3, etc. Is >>> there any simple way to do this automatically? I have tried -egen rank, >>> track-, but it returns v3. >>> >>> +------------+ >>> | v1 v2 v3 | >>> |------------| >>> 1. | 1 1 1 | >>> 2. | 1 1 1 | >>> 3. | 15 2 3 | 4. | 15 2 3 | 5. | 47 3 5 | 6. | 47 3 5 >>> | >>> +------------+ >>> >>> Many thanks! >>> >>> Alexey Bessudnov >>> DPhil student in sociology >>> St.Antony's College, Oxford University > * * 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: interval variable to rank variable***From:*Alexey Bessudnov <bessudnov@googlemail.com>

**Re: st: interval variable to rank variable***From:*Eva Poen <eva.poen@gmail.com>

**Re: st: interval variable to rank variable***From:*Austin Nichols <austinnichols@gmail.com>

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