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Hi, Can anyone explain me the differences in Q and R mode in Principal Component Analysis, as performed by prcomp and princom respectively. Regards L?vio Cipriano

The documentation says, "pmax and pmin take several vectors as arguments and return a single vector giving the parallel maxima (or minima) of the vectors." I discovered that, if you use a matrix or array instead of a vector, pmax returns a matrix or array, respectively. This makes pmax and pmin much more useful, and should not be left to people to discover on their own! For example:

Hi there. R v1.3.0, Slackware linux 7.1 or Windows 98SE, PII 266, 64Mb RAM. I notice that under windows, R puts help info (ie. the response to '?<function>') into a new window, whereas under linux, it puts it into the main console window. I find the former much more helpful when checking a function's syntax. Is there a simple way of configuring R under linux to put its help

In a recent post, I reported that help.start worked with Mozilla, although it had not worked before. I now have discovered the difference. I'm using RH Linux 7.1 and Mozilla 0.9.5 and R 1.3.1. When I tried it before, I had use ESS to start R. If I run R without ESS, help.start() will start the browser (Mozilla), but help(apply), for example, will produce help in ESS but not in the browser.

I decided to try out Xemacs instead of Emacs in Linux (RH 7.2). After doing lots of configuration of Xemacs, I finally discovered a major problem. With Emacs, when I use R, I start Emacs twice (at least), in different viewports, once as emacs -f R and once as emacs myfile.R Then I try commands in the first one, and, when they work (which isn't very often), I cut the command with C-w,

Hi, All. I'd have a set of data in an array: process <- c( 5 , 7 , 4 , 1 , 4 , 1 , 4 , 1 , 4 , 4 , 1 , 5 , 4 , ...) and I'd like to know the number of transitions in this data. I calculate transitions as the number of times a number follows another number. thus, something like this would be a 1 deep transition: 1 --> 1 : 10% (and actual number of 1 --> 1 occurrences) 1

I did some serach around. It seems that ROC curve computation is not supported on R. Anyone has some leads? Thanks. Jason ===== Jason G. Liao, Ph.D. Division of Biometrics UMDNJ School of Public Health 335 George Street, Suite 2200 New Brunswick, NJ 08903-2688 phone (732) 235-9748, fax (732) 235-9777 http://www.geocities.com/jg_liao __________________________________________________ Great

...ling.ohio-state.edu> Try pico. There's no substitute for/comparison with emacs, though, IMHO. but just to be sure: you don't have to have ESS to use (x)emacs for editing R scripts. Sven Garbade <garbade at psy.uni-muenchen.de> ESS can be installed via rpm on Mandrake. baron at cattell.psych.upenn.edu (Jonathan Baron) ESS is the real answer to your question, and anything else has got to be more difficult. Nels Tomlinson <tomlinso at purdue.edu> Installing ESS on debian was as simple as apt-get install ess. David Lucy <dlucy at maths.ed.ac.uk> & "Stuart Le...

...) table(factor(x, levels=v)), sort(unique(as.vector(x2)))) [,1] [,2] [,3] [,4] 1 4 3 0 3 2 2 3 3 0 3 1 1 4 4 Bill Venables. -----Original Message----- From: Robin Hankin [mailto:r.hankin at auckland.ac.nz] Sent: Wednesday, June 25, 2003 2:13 PM To: baron at cattell.psych.upenn.edu Cc: r-help at stat.math.ethz.ch; toth at host.sk Subject: Re: [R] frequency table Professor Baron writes: > > A neat trick with table() is that you can use it to tabulate > columns of a matrix (for example) with: > > apply(mymatrix,2,table) > OK, I'll bi...

This isn't really a bug so much as an undocumented feature, but perhaps the help file should be changed. If you say match(x,y) you get the values of the _first_ instance in y that matches each value of x. If you say x %in% y you get "TRUE" for every match, not just the first. This is useful, now that I know it, but perhaps the thing about the first instance should be documented.

How do I update to a new version of R on Linux without going through a new installation? How do I update packages? -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To:

I'm trying to understand better the differences between fixed and random effects by running very simple examples in the nlme package. My first attempt was to try doing a t-test in lme. This is very similar to the Rail example that comes with nlme, but it has two groups instead of five. So I try a1 <- 1:10 a2 <- 7:16 t.test(a2,a1) getting t(18)=4.43, p=.0003224. Then I try to do it

The Goodman/Kruskal gamma is a nice descriptive rank-order correlation statistic, often used in psychology. It is nice because it is easy to understand. It takes all pairs of values of each variable and asks whether they are congruent (S+ is the number in the same order for both variables) or discordant (S-, opposite ranking). The statistic is (S+ - S-)/(S+ + S-). It is like tau except for the

> Ok...So I actually *typed* the table with WordPad, using the Tab button >in order to separate the columns, and saved it in rich text format. As you >might have guessed, it didn´t work. I got a: > Error in count.fields(file, sep, quote, skip, blank.lines.skip) : > string terminated by newline or EOF RTF is not what is meant by text. What I am writing is text. Your

Dear All, I want to know if there is some easy and reliable way to estimate the number of dominant eigenvalues when applying PCA on sample covariance matrix. Assume x-axis is the number of eigenvalues (1, 2, ....,n), and y-axis is the corresponding eigenvalues (a1,a2,..., an) arranged in desceding order. So this x-y plot will be a decreasing curve. Someone mentioned using the elbow (knee)

hi, I have a matrix (representing original data) that looks e.g. like this (consider it beeing x,y,z coords): 441 447 0 265 407 0 374 223 0 288 574 0 669 309 0 591 195 0 595 475 0 424 351 0 I get a second matrix (subject data) that is similiar to the above matrix but it is scaled, translated and rotated (and of course a little inprecise). Also I have an

I want to write a function to take an argument as the response variable of a linear model, e.g. to do anova's across a list of variables, something like the following (except, of course, this doesn't work): function(x) { anova(lm(x ~ my.factor,data=my.data)) } The x in lm() above is getting evaluated at the wrong level. How can I make this work? -- Russell Senior ``The two

As a user of only R, I don't use much of the potential of ESS and Emacs. Without entering a religious feud, is there any reason I should use XEmacs rather than my current GNU Emacs? (I looked on the XEmacs site, but I didn't understand the programming issues they were talking about (over my head).) Martin Henry H. Stevens, Assistant Professor 338 Pearson Hall Botany Department Miami

...: grimm.heinz@rcc.ch Date: Wed, 11 Sep 2002 15:17:53 +0200 (MET DST) * PR# 2005 * Subject: R_HOME/etc/Renviron.site not interpreted on windows From: Uwe Ligges <ligges@statistik.uni-dortmund.de> Date: Thu, 12 Sep 2002 13:34:55 +0200 * PR# 2018 * Subject: missing data in stripchart From: baron@CATTELL.psych.upenn.edu Date: Sat, 14 Sep 2002 19:35:32 +0200 (MET DST) * PR# 2019 * Subject: p.s. regarding stripchart missing-data report From: Jonathan Baron <baron@cattell.psych.upenn.edu> Date: Sat, 14 Sep 2002 13:48:34 -0400 * PR# 2023 * Subject: mosaicplot enhancements From: Uwe Ligges <lig...

Hello! Disapointed about SPSS I have to choose another statistic program. And altough I sympathise with the idea of a non-commercial software-project like R and I like the spirit of the R community (and of course I am not keen on paying 150$ to SAS for a one-year students license), I will probably buy SAS, because people I will work with use SAS and I want a close cooperation with them. Besides I