Greg Ridgeway <gregridgeway <at> gmail.com> writes: > > I am working on a new package, one in which the user needs to specify the > role that different variables play in the analysis. Where I'm stumped is > the best way to have users specify those roles.
[delete discussion of dot in formula and specials] > > Does anyone have advice on how best to handle this? > 1. Tell my tester "Tough, you can't use dots in a formula in my > package".essentially what the survey package seems to do. Encourage the > use of survey::make.formula()? > 2. Fix Approach #1 to search for duplicates in the weights, observation > ID,and strata parameters. Any elegant ways to do that? > 3. Fix Approach #2, the coxph style, to try to remove redundant > covariates. > Not sure if there's a graceful way not involving string matching > 4. Any existing elegant approaches to interpreting the dot? Or should I > just do string matching to delete duplicate variables from the terms > object. > See ?terms.formula and note the `allowDotAsName' arg. > trms <- terms(y~speshul(x)+.,allowDotAsName=TRUE,specials="speshul") > attr(trms,"term.labels") [1] "speshul(x)" "." See ?all.vars > all.vars(trms) [1] "y" "x" "." > setdiff( all.vars(trms) , "." ) [1] "y" "x" > HTH, Chuck ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
