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From |
"Joseph Coveney" <jcoveney@bigplanet.com> |

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

Subject |
Re: st: using multiple variable lists in ancova |

Date |
Mon, 12 Nov 2007 01:19:04 +0900 |

Cathy L. Antonakos wrote: This question relates to the use of multiple variable lists (parallel lists). I have a dataset with many physiologic measures collected at two time points. There are three grouping variables (gp1, gp2, gp3). [redacted] I can use -foreach- to call each group variable separately, saving some time, as follows: local gp "gp1 gp2 gp3" foreach var of varlist `gp' { anova bt at `var' anova btx atx `var' anova btz atz `var' } But I'd like to figure out a way to call the lists of variables to reduce the number of anova commands, something like: anova `var2' `var1' `gp', cont(`var1') Is there a way to do that? -------------------------------------------------------------------------------- You mention parallel lists at first, but what you ask for looks more like nested loops. You can loop over pretest-posttest variables and grouping variables in a nested structure as follows: foreach response of varlist b* { local baseline = subinstr("`response'", "b", "a", 1) foreach groupvar of varlist gp* { anova `response' `baseline' `groupvar', continuous(`baseline') } } This assumes that all variables in your dataset beginning with "b" are response variables with a corresponding baseline that is named identically with the exception of the first letter, which is "a". Note that there's also a macro extended function for the string substitution. -help extended_fcn- and scroll down to the section titled, "Macro extended functions for parsing". For parallel lists, see the FAQ "How do I process parallel lists?" at http://www.stata.com/support/faqs/lang/parallel.html . Joseph Coveney P.S. I assume that you're aware of Roger Newson's -smileplot- and -multproc-. -findit smileplot- if not. P.P.S. You might be able to gain some efficiency with -sureg-. * * 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**:**Re: st: using multiple variable lists in ancova***From:*"Cathy L. Antonakos" <cathya@umich.edu>

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