Issue with data() function

I found an issue with the data() command this evening when working on the survival package.

1. I have a lot of data sets in the package, almost all used in at least one vignette, 
help file, or test.? As a space saving measure, I have bundled many of them together, 
i.e., the file data/cancer.rda contains 19 data sets, many of them small. The resulting 
file (using xz compression) is quite a bit smaller than the individual ones.? (I still get 
a warning note about size from R CMD check, but I'm no longer 2x the limit.)

2. Consider the lung data set.? All of these fail:
 ?? data(lung)
 ?? data("lung")
 ?? data(lung, package="survival")

 ?a. The lung.Rd file had \usage{data(lung)}; that error was not caught by R CMD check.? 
(Several other .Rd files as well.)

 ?b. In broader examples for teaching, I sometimes load data from other packages, e.g 
data(aidssi, package="mstate").? But this does not work for survival.? (The larger 
survival data sets that are in separate .rda files can be found.)

 ?c. What does work is survival::lung.? Might it be useful to add a comment to data.Rd to 
this effect?


3. Creating a separate package 'survivaldata' is of course one route, and is suggested in 
the "Writing R Extensions" guide.? But this is not possible since survival is a 
recommended package: it can't load any non-recommended package for it's tests or 
vignettes.? Longer term, perhaps there is way around this constraint?

Terry T.

Terry M Therneau, PhD
Department of Health Science Research
Mayo Clinic
therneau at mayo.edu

"TERR-ree THUR-noh"


	[[alternative HTML version deleted]]