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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: RE: Re: RE: loop within loop |

Date |
Tue, 19 Oct 2004 09:09:46 +0100 |

This code does more work than is necessary. A better version is below. (Still not tested.) tokenize "a b c d e" qui forval i = 1/4 { local I = `i' + 1 forval j = `I'/5 { forval y = 1988/2003 { forval m = 1/12 { corr ``i'' ``j'' if year == `y' & month == `m' replace ``i''``j'' = r(rho) if year == `y' & month == `m' } } } } Nick n.j.cox@durham.ac.uk > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Nick Cox > Sent: 18 October 2004 23:30 > To: statalist@hsphsun2.harvard.edu > Subject: st: RE: Re: RE: loop within loop > > > I am less clear now on what your real problem is. > > But being interested in several variables doesn't > make the issues any different. If you > want to put correlations into variables, you > must still operate with one correlation from > each pair of variables. -matrix accum- looks to me > like a poor choice of method. You end up > putting stuff into a matrix and then need > to get it out again, a bit like going to Houston > from Dallas via San Antonio, perhaps instructive > but nevertheless indirect. As you are cycling > over years and months, you need to work with > several matrices, which makes the problem yet > more complicated. > > If I had a varlist a b c d e, there are > ten distinct correlations which we can denote > ab ac ad ae bc bd be cd ce de. > > So I can go > > foreach v in ab ac ad ae bc bd be cd ce de { > gen `v' = . > } > > and then some code to get all the correlations > from all pairs of variables, all years and months > might look like this, but this isn't tested: > > tokenize "a b c d e" > qui forval i = 1/4 { > forval j = 2/5 { > forval y = 1988/2003 { > forval m = 1/12 { > corr ``i'' ``j'' if year == `y' > & month == `m' > replace ``i''``j'' = r(rho) if > year == `y' & month == `m' > } > } > } > } > * * 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/

**Follow-Ups**:**st: Re: RE: RE: Re: RE: loop within loop***From:*"Wang,Le" <lew@mail.smu.edu>

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