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Apologies if this is the wrong list, but could somebody put the information on how to create the graphs on http://www.r-project.org/screenshots/screenshots.html (or a link to these instructions) next to the graphs?

Try: MxRank <- function(x, na.last = "keep") { if (na.last != "keep") return(rank(x, na.last)) else { r <- x*NA NoWarn(r[is.orderable(x)] <- rank(x,na.last=NA)) return(r) } } Knut M. Wittkowski, PhD,DSc ------------------------------------------ The Rockefeller University...

We are in the final stage of testing a unification, generalization, and speed-improvement of 'kruskal.test' and 'friedman.test' (tentatively named 'prentice.test') and are inviting comments before turning this into a package. The script and the draft help...

Patrick Drechsler <patrick <at> pdrechsler.de> writes: > > Knut M. Wittkowski wrote: > > Apologies if this is the wrong list, but could somebody put the > > information on how to create the graphs on > > http://www.r-project.org/screenshots/screenshots.html (or...

We have packed logical vectors into integers, 32 flags at a time and then want to AND or OR these vectors of "integers" using other C functions. The problem: occasionally, the packed sequence of 32 logical values resembles NA, causing...

At 10:43 2003-06-04 -0300, you wrote: >David A. Paul wrote: > > > I don't have the reference, but a biologist friend of mine once > > showed me a refereed journal article that purported to demonstrate > > numerical errors made by...

Dear Cecilia, while Saghir and Kjetil may have a point, guidances are no laws. After all, it's your presentation and only you can decide what suits the specific purpose best. An R logo can be found on http://www...

Hello Samuel, Regardless of some more fundamental problems (see below), a test to "prove" normality based on a sample of 9? - Fugetaboutit. Knut At 10:20 2004-02-06 +0100, I wrote: >... > >It may be tempting to interpret a non...

Hi Arne, This seems to be more a statistics than an R problem. Let's assume, one stratum is male and the other is female, and that you are giving estrogen. With women, it may be better to have more...

> Jue: In R, wilcox.test does not actually do the Wilcoxon, but the Mann Whitney test. While the tests are equivalent, the former is based on the rank sum, while the latter is based on the sum of u-scores...

Nicolaas: All linear rank tests, including the Kruskal-Wallis test, can be applied to multivariate data, provided that all the variables have the same orientation as an underlying unmeasurable (latent) factor. You score the multivariate observations first and then treat...

Andy and Peter: Of yours, both of you are right. Re h2g2 (Adams DN 1979): >"[42] quite definitely is the answer. I think the problem, to be quite >honest with you, is that you've never actually known what the...

Last Friday, Gregory Chaitin (http://www.umcs.maine.edu/~chaitin/lm.html) mentioned that there can be no proof that a given code is the shortest for a problem, even within a language. Still, the script below, a replacement of...

The function 'wilcox.test' in R and S gives (almost) identical results (see below). 'qwilcox' however, does not: > qwilcox(p,5,5) p: 0.025 0.975 -------------------- R> 3 22 S> 18 37 I originally wanted to ask a questions...

At 14:12 2004-05-12 +0100, you wrote: >Hi, > >I would like to do a MannWitney test. >Can anyone help me with the proper command? > >Thanks, >Margarida You may use wilcox.test or qwilcox, but beware of some subtleties...

Matthias The function "fivenum", defines quantiles by assuming that the i-th order statistic is the (i-0.5)/(length(x)) quantile. Thus, it defines a 25% quantile by finding the cutoff point where 25% are below and 75% above...

Another problem with the R function "quantile" is that its definition of "quantiles" may be not what you expect. Consider the following: > x <- matrix(c(1:4)) > quantile(x,c(0,.25,.5,.75,1)) 0% 25% 50% 75% 100...