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

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

Subject |
st: RE: Scripting Question |

Date |
Fri, 29 Apr 2005 17:06:10 +0100 |

Assuming you want 1 with 2 3 with 4 5 with 6 7 with 8 then it is one loop, not two, and better phrased that way: forval i = 1(2)7 { local k = `i' + 1 ... } What you have is almost legal. You'd need forval i = 1(2)7 { foreach k in `=`i'+1' { ... } } but as the inner loop is over a single index, you can replace it as above. Nick n.j.cox@durham.ac.uk Martin M. Monti > I'm trying to write a .do file that may scroll through my variables > performing simple tabstats and ttests on pairs of variables. The key > variables to test/tabstat are identified by a string (e..g > "judged") and an > appended number (thus: e..g judged1, judged2, ...). A simple > loop on an `i' > macro will allow me to specify judged`i' in the loop and have > it scroll > through the various variables, but when I set a second macro > (say `k') > making it equal to `i'+1 (so that I can always do ttestes on > variables in > sequence (e.g. ttest time`i' = time`k' so that it's always > "ttest time1 = > time2", "ttest time3 = time4", and so on)) even though it > will loop through > the correct numbers (thus `k' is correctly being set to > `i'+1), it will not > allow me to append it to the string (unlike `i'!). > > Here is the loop I use: > > *the loop only sets `i' to odd numbers (so that `k' can > scroll through the > even ones) > forvalues i = 1 (2) 7 { > foreach k in `i'+1 { > table judged`i' judged`k' > tabstat time`i' time`k', stats(mean sd N) > ttest time`i' = time`k' if (judged`i' == 1 & judged`k' == 1) > tabstat rate`i' rate`k', stats(mean sd N) > ttest rate`i' = rate`k' if (judged`i' == 1 & judged`k' == 1) > } > } > > Note, I''ve tried running the loop and the problem is that as > it is supposed > to execute the commands with `k' it will say that the > variable judged (only > with the `k' appended!) is ambiguous. Also, if I run the same > exact loop, > just replacing the 5 commands with only: display `i' and > display `k' it will > scroll correctly through the numbers. * * 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: Scripting Question***From:*"Martin M. Monti" <mmonti@Princeton.EDU>

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