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From |
"Wang,Le" <lew@mail.smu.edu> |

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

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

Date |
Tue, 19 Oct 2004 22:22:05 -0700 |

Nick Thank you very much. I think it works. Le ----- Original Message ----- From: "Nick Cox" <n.j.cox@durham.ac.uk> To: <statalist@hsphsun2.harvard.edu> Sent: Tuesday, October 19, 2004 1:09 AM Subject: st: RE: RE: Re: RE: loop within loop > 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/ * * 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/

**References**:**st: RE: RE: Re: RE: loop within loop***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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