[R] [External] Creating model formulas programmatically

[Richard M. Heiberger]

my take of the assignment was to avoid 'parse' specifically.
we start with a character vector, so avoiding characters is not possible. i was dealing with the fortune "if parse is the answer, you have the wrong question"

Sent from my iPhone

On Mar 29, 2025, at 15:39, Bert Gunter <bgunter.4567 using gmail.com> wrote:


Thanks, Rich.

I thought of that, too, but it violates the spirit of my restraints (to avoid character strings), which I unfortunately did not clearly articulate. So my apologies for that failure. My concern is that with more complex model formula, using as.formula, etc. to parse/convert character strings can get a bit hairy. But in most cases, as here maybe, it may be perfectly fine. So think of my post as mostly my attempt to learn some new tricks rather than to solve a useful problem. I hope this is not unfair to the list.

Cheers,
Bert





On Sat, Mar 29, 2025 at 3:12 PM Richard M. Heiberger <rmh using temple.edu<mailto:rmh using temple.edu>> wrote:
> somenames <- c("Heigh", "Ho", "Silver", "Away")
> as.formula(paste("~(",paste(somenames, collapse="+"),")^2"))
~(Heigh + Ho + Silver + Away)^2
>

> On Mar 29, 2025, at 14:30, Bert Gunter <bgunter.4567 using gmail.com<mailto:bgunter.4567 using gmail.com>> wrote:
>
> somenames <- c("Heigh", "Ho", "Silver", "Away")



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