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From |
Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Combinations of 3 |

Date |
Sun, 19 Dec 2010 16:16:20 -0800 |

****************************************** // generate some data clear set obs 100 g v = runiform() forv i=1/6{ g n`i' = runiform() } // sum variables forv i=1/5 { forv j = `=`i'+1'/6 { g v_n`i'_n`j' = v + n`i' + n`j' } } su ****************************************** T On Sun, Dec 19, 2010 at 4:03 PM, Kari Hexem <khexem@gmail.com> wrote: > Hi, > > I would like to sum the numbers of variable v with 6 other variables: > n1, n2, n3, n4, n5, n6, > in combinations of 3. So the results would be the sums of the > following variables, > identified using 15 combinations (6 choose 2), or, to spell it out, > the sums of each of these > following possibilities: > v-n1-n2 > v-n1-n3 > v-n1-n4 > v-n1-n5 > v-n1-n6 > v-n2-n3 > v-n2-n4 > v-n2-n5 > v-n2-n6 > v-n3-n4 > v-n3-n5 > v-n3-n6 > v-n4-n5 > v-n4-n6 > v-n5-n6 > > I can get the sum of the first two of the 3 variables by using the > following code: > forvalues i=1(1)6 { > gen sum`i' = v + n`i' > } > > but I can't figure out how to add in the 3d variable, which can't be a > repeat of the 2nd variable (ie. v-n1-n1 is not allowed). Thoughts? I > feel like it should have something to do with nested loops, or the > -selectvars- command, but I am totally stuck. Any help would be > greatly appreciated. > > Thanks, > Kari > * > * 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/ > -- To every ω-consistent recursive class κ of formulae there correspond recursive class signs r, such that neither v Gen r nor Neg(v Gen r) belongs to Flg(κ) (where v is the free variable of r). * * 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: Combinations of 3***From:*Kari Hexem <khexem@gmail.com>

**References**:**st: Combinations of 3***From:*Kari Hexem <khexem@gmail.com>

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