[Rd] Regression stars
Norm Matloff
matloff at cs.ucdavis.edu
Sat Feb 9 22:19:48 CET 2013
I appreciate Tim's comments.
I myself have a "social science" paper coming out soon in which I felt
forced to use p-values, given their ubiquity. However, I also told
readers of the paper that confidence intervals are much more informative
and I do provide them. As I said earlier, there is no avoiding that,
and R needs to report p-values for that reason.
Instead, the question is what to do about the stars; I proposed
eliminating them altogether. Star-crazed users know how to determine
them themselves from the p-values, but deleting them from R would send a
message.
I did say my proposal was "bold," which really meant I was suggesting
that R do SOMETHING to send that message, not necessarily star
elimination.
One such "something" would be the proposal I made, which would be to add
confidence intervals to the output. This too could be just an option,
but again offering that option would send a message. Indeed, I would
suggest that the help page explain that confidence intervals are more
informative. (The help page could make a similar statement regarding
the stars.)
When I pitch R to people, I say that in addition to the large function
and library base and the nice graphics capabilities, R is above all
Statistically Correct--it's written by statisticians who know what they
are doing, rather than some programmer simply implementing a formula
from a textbook. I know that a lot of people feel this is one of R's
biggest strengths. Given that, one might argue that R should do what it
can to help users engage in good statistical practice. I think this was
Frank's point.
Norm
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