similar to: Cross-validation

Hi R-help, I have a database of 10 students who have written an overall of 78 essays. The challenge? I would like to identify who wrote the 79th essay. Has anybody used R in this context? Even if not, would you suggest me which pattern recognition technique I might possibly apply? Thanks a lot and regards, Tom --------------------------------- [[alternative HTML version

Dear All, Is this right? > floor((5.05-floor(5))*100) [1] 4 I would expect 5, or am I wrong? Thanks and regards, W --------------------------------- [[alternative HTML version deleted]]

Hi R-Help, I have just downloaded RSPerl_0.7-0.tar.gz under SuSe. If I type owner@linux: ~work> R CMD INSTALL -c RSPerl_0.7-0.tar.gz i get the following error message makedir: cannot create directory '/user/lib/R/library/00LOCK' : Permission denied ERROR: failed to lock directory '/usr/lib/R/library' for modifing I would really appreciate if somebody can help me

Dear All, While inverting a matrix the following error appears on my console: Error in solve.default(my_matrix) : Lapack routine dgesv: system is exactly singular With this respect, I have been replacing the solve() function with ginv(): the Moore-Penrose generalized inverse of a matrix. These are the questions I would like to ask you: 1. Would you also replace solve() with ginv() in

Hi there, The optim(par, fn, ...parscale...) function in R requires 'parscale' which is defined as: "A vector of scaling values for the parameters. Optimisation is performed on 'par/parscale' and these should be comparable in the sense that a unit change in any element (??) produces a unit change in the scaled value". I am just not understanding the

Hi, how can I tell 'summary' to print the name of the summarised variable? This is probably an awkward newbie question but I didn't find an answer in the Docus, the FAQ and maillist archive. I want a summary for about 250 variables and realise it the following way (I know, that I shouldn't use iterations that way in R; but at the moment it's the easiest way for me):

I encountered a problem with dom0 when rebooting and running an intel gigabit card using the pro/1000 driver. When the system tries to shut down I get the following output of an strace command : ......... 17:10:49.063616 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3 <0.000029> 17:10:49.063689 ioctl(3, 0x8913, 0xbffffc80) = 0 <0.000018> 17:10:49.063751 ioctl(3, 0x8914, 0xbffffc80) =

As an R absolute beginner and an expert (very old) statistician and latex user, I'm interested in using R to produce AUTOMAGICALLY tables in latex format. I mean I would like to have the means to build an R procedure generating **FROM INSIDE** a table or a graph to be inserted directly into latex. I've read http://hesweb1.med.virginia.edu/biostat/s/doc/summary.pdf where the author speaks

Hi R-experts, I want to use the jackknife function from the bootstrap package onto a linear model. I can't figure out how to do that. The manual says the following: # To jackknife functions of more complex data structures, # write theta so that its argument x # is the set of observation numbers # and simply pass as data to jackknife the vector 1,2,..n. # For example, to jackknife #

Colleagues, I am encountering difficulty adding formatted text to a graphic. Specifically, I want to add a superscript in the middle of a text string but I would like to format the text string on the fly. The commands: plot(1,1) ARG <- bquote('TEXT'^'\u00ae') mtext(ARG, line=-2, side=1) yield the desired output. However, my goal is to paste together a string, then pass

Hi dear all, Can aynone help me about delete-d jackknife usually normal jackknife code for my data is: n <- nrow(data) y <- data$y z <- data$z theta.hat <- mean(y) / mean(z) print (theta.hat) theta.jack <- numeric(n) for (i in 1:n) theta.jack[i] <- mean(y[-i]) / mean(z[-i]) bias <- (n - 1) * (mean(theta.jack) - theta.hat) print(bias) but how i can apply delete-d jackknife

Hi, My question is: Can anyone recommend a cheap graphics board that works well with the GNU/Linux/X/Firefox/Swfdec/Youtube stack? I am using an old ATI Radeon 9550, and I have been experiencing 100% CPU usage, stuttering and loss of sync when viewing Youtube movies for quite a long time now (since Swfdec v 0.6.x, now using 0.8.2). Didn't bother to report it because I've seen

Hello; I am trying following but getting a warning message : Warning in rbind.zoo(...) : column names differ, no matter whatever I do. Also I do not want to specify column names manually, since I am just writing a wrapper function around getSymbols to get chunks of data from various sources - oanda, dividends etc. I tried giving col.names = T/F, header = T/F and skip = 1 but no help. I think

Below is a SIMEX object that was generated with the "simex" function from the "simex" package applied to a logistic regression fit. From this mountain of information I would like to extract all of the values summarized in this line: .. ..$ variance.jackknife: num [1:5, 1:4] 1.684 1.144 0.85 0.624 0.519 ... Can someone suggest how to go about doing this? I can extract the

While doing pls I found the following problem > BHPLS1 <- plsr(GroupingList ~ PCIList, ncomp = 10, data = PLSdata, jackknife = >FALSE, validation = "LOO") when not enabling jackknife the command works fine, but when trying to enable jackknife i get the following error. >BHPLS1 <- plsr(GroupingList ~ PCIList, ncomp = 10, data = PLSdata, jackknife = >TRUE,

Hey List, Firstly I am sorry for the length of this email and that you are all having too receive it but the point is that this email will now go into the archive and be indexed by Google (hopefully) and thusly, people will be able to find these links through Google. My goal is to mirror CentOS on RapidShare. "Why you fool there are loads of mirrors?" you might ask; simply for

Hi all, I hope this isn't a naive newbie question again. Here you can see column 264 of a data frame containing data of the same interview in May and September. Column 264 contains the answers of 49 persons to a question in May. > fbhint.spss1[,264] [1] teils/teils sehr wichtig <NA> <NA> sehr wichtig [6] sehr wichtig sehr wichtig sehr wichtig <NA>

Hi, I have setup freebsd, postfix, dovecot and maia, but all the time i get the following error in /var/log/maillog - and i cant google me to the solution, please advice. Aug 9 12:18:49 mail02 dovecot: auth(default): Authentication client trying to connect to master socket Aug 9 12:18:49 mail02 postfix/smtpd[1356]: fatal: no SASL authentication mechanisms Aug 9 12:18:50 mail02

Dear R friends I´m interested into apply a Jackknife analysis to in order to quantify the uncertainty of my coefficients estimated by the logistic regression. I´m using a glm(family=’binomial’) because my independent variable is in 0 - 1 format. My dataset has 76000 obs, and I´m using 7 independent variables plus an offset. The idea involves to split the data in let’s say 5 random subsets and

On 2019-10-15 19:11, Job Snijders wrote: > The S in SSH stands for secure. You are asking the wrong group of people. > You?ll have to resolve your issue in some other way. > This tool would only support running on stdin/stdout. Indeed, an idiomatic use-case would be to use it as the command argument to ssh(1). The assumption I am making is that anyone that can pass arbitrary data to