In my view, that's just plain wrong, because strata() is not a function but a
special operator in a model formula. Wouldn't it also blow up on
stats::offset()?
Oh, yes it would:
> lm(y~x+offset(z))
Call:
lm(formula = y ~ x + offset(z))
Coefficients:
(Intercept) x
0.7350 0.0719
> lm(y~x+stats::offset(z))
Call:
lm(formula = y ~ x + stats::offset(z))
Coefficients:
(Intercept) x stats::offset(z)
0.6457 0.1078 0.8521
Or, to be facetious:
> lm(y~base::"+"(x,z))
Call:
lm(formula = y ~ base::"+"(x, z))
Coefficients:
(Intercept) base::"+"(x, z)
0.4516 0.4383
-pd
> On 26 Aug 2024, at 16:42 , Therneau, Terry M., Ph.D. via R-devel
> <r-devel@r-project.org> wrote:
>
> The survival package makes significant use of the "specials" argument of
> terms(), before
> calling model.frame; it is part of nearly every modeling function. The reason
> is that
> strata argments simply have to be handled differently than other things on
> the right hand
> side. Likewise for tt() and cluster(), though those are much less frequent.
>
> I now get "bug reports" from the growing segment that believes one should put
> packagename:: in front of every single instance. For instance
> fit <- survival::survdiff( survival::Surv(time, status) ~ ph.karno +
> survival::strata(inst), data= survival::lung)
>
> This fails to give the correct answer because it fools terms(formula,
> specials=
> "strata"). I've stood firm in my response of "that's your bug, not mine",
> but I begin
> to believe I am swimming uphill. One person responded that it was company
> policy to
> qualify everything.
>
> I don't see an easy way to fix survival, and even if I did it would be a
> tremendous amout
> of work. What are other's thoughts?
>
> Terry
>
>
>
> --
>
> Terry M Therneau, PhD
> Department of Quantitative Health Sciences
> Mayo Clinic
> thern...@mayo.edu
>
> "TERR-ree THUR-noh"
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd....@cbs.dk Priv: pda...@gmail.com
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