Displaying 4 results from an estimated 4 matches for "jjthaden".
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jjharden
1999 Jun 29
3
S v. 5
Does R, or will R, be integrating the changes to the Chambers/Lucent S
language under their version 5.0? If not already, then when?
John Thaden
Little Rock, Arkansas, USA
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1999 Jun 18
1
Stepwise model selection question
...you? If a stepwise
algorithm ranks possible cofactors--perhaps even assigns them an F
value--can you use that ranking to make any comparisons among possible
cofactors? What do the F values mean?
************************************************************
John J. Thaden, Ph.D., Instructor jjthaden at life.uams.edu
Department of Geriatrics (501) 257-5583
University of Arkansas for Medical Sciences FAX: (501) 257-4822
mail & ship to: J. L. McClellan V.A. Medical Center
Research-151 (Room GB103 or GC124)
4300 West 7th Street
Little Rock AR 72205 USA
********...
1999 Jun 23
2
coercing factors to matrix() --> num/char ? --
Peter Dalgaard BSA <p.dalgaard at biostat.ku.dk> wrote:
> Martin Maechler <maechler at stat.math.ethz.ch> writes:
[ snip... ]
> > >From this logic, coercing to a matrix should coerce to character rather
> > than integer/numeric codes.
>
> Hm. I'm not sure there really is much logic in this... Factors are
> sometimes character-like, sometimes
2008 Oct 07
3
vectorized sub, gsub, grep, etc.
R pattern-matching and replacement functions are
vectorized: they can operate on vectors of targets.
However, they can only use one pattern and replacement.
Here is code to apply a different pattern and replacement
for every target. My question: can it be done better?
sub2 <- function(pattern, replacement, x) {
len <- length(x)
if (length(pattern) == 1)
pattern <-