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.... I'm glad to learn of all the other solutions offered, too. They broadened my understanding of what I was doing in my statistics class and how I was doing it in R. Thanks, all who contributed to this thread. Thanks, again, Neal, for your help. -Kevin On Sat, 2025-03-29 at 13:46 -0700, Neal Fultz wrote: > > > > I've been setting up problems like this with code similar to: > > =========================== > > df <- data.frame( > > ??? survey = c(rep("1980", 1000), rep("2010", 1000)), > > ??? DP = c(rep("Y", 0.66*1000),...

...uot;%or%" <- function (e1, e2) { if (!e1) { if (is.character(e2)) abort.estring(e2) else eval(e2) } } I do not know whether it is possible to build an abort.estring function that does what I want, but R seems flexible enough to do almost anything. I have a sketch of [b], thanks to Neal Fultz, but not of [a]. I hope this organizational design helps some others. regards, /iaw ---- Ivo Welch (ivo.welch@gmail.com) http://www.ivo-welch.info/ <http://www.ivo-welch.info/> [[alternative HTML version deleted]]

...call the corresponding methods of plot() and lines(), e.g, when x is a "Date" or "POSIXct" object; prompted by Spencer Graves' suggestion. * stopifnot() now allows customizing error messages via argument names, thanks to a patch proposal by Neal Fultz in PR#17688. * unlink() gains a new argument expand to disable wildcard and tilde expansion. Elements of x of value "~" are now ignored. * mle() in the stats4 package has had its interface extended so that arguments to the negative log-likelihood function can be one...

...call the corresponding methods of plot() and lines(), e.g, when x is a "Date" or "POSIXct" object; prompted by Spencer Graves' suggestion. * stopifnot() now allows customizing error messages via argument names, thanks to a patch proposal by Neal Fultz in PR#17688. * unlink() gains a new argument expand to disable wildcard and tilde expansion. Elements of x of value "~" are now ignored. * mle() in the stats4 package has had its interface extended so that arguments to the negative log-likelihood function can be one...

...call the corresponding methods of plot() and lines(), e.g, when x is a "Date" or "POSIXct" object; prompted by Spencer Graves' suggestion. * stopifnot() now allows customizing error messages via argument names, thanks to a patch proposal by Neal Fultz in PR#17688. * unlink() gains a new argument expand to disable wildcard and tilde expansion. Elements of x of value "~" are now ignored. * mle() in the stats4 package has had its interface extended so that arguments to the negative log-likelihood function can be one...