[R] standard error for median
Dear all, is it possible to estimate a standard error for the median? And is there a function in R for this? I want to use it to describe a skewed distribution. Thanks in advance, Ralph [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] standard error for median
Dear Prof. Ripley, thank you for your fast answer. But which book do you mean? I can't find an MASS book. Do you mean the R book? Best wishes, Ralph Am Samstag, den 07.03.2009, 21:24 + schrieb Prof Brian Ripley: It is an example (both via asymptotic theory and the bootstrap) in chapter 5 of MASS (the book). The functions used are in the scripts of the MASS package, but you will need to understand the theory being used as described in the book. On Sat, 7 Mar 2009, Ralph Scherer wrote: Dear all, is it possible to estimate a standard error for the median? And is there a function in R for this? I want to use it to describe a skewed distribution. Thanks in advance, Ralph [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] standard error for median
Ok, found it. Thanks. Am Samstag, den 07.03.2009, 22:34 +0100 schrieb Ralph Scherer: Dear Prof. Ripley, thank you for your fast answer. But which book do you mean? I can't find an MASS book. Do you mean the R book? Best wishes, Ralph Am Samstag, den 07.03.2009, 21:24 + schrieb Prof Brian Ripley: It is an example (both via asymptotic theory and the bootstrap) in chapter 5 of MASS (the book). The functions used are in the scripts of the MASS package, but you will need to understand the theory being used as described in the book. On Sat, 7 Mar 2009, Ralph Scherer wrote: Dear all, is it possible to estimate a standard error for the median? And is there a function in R for this? I want to use it to describe a skewed distribution. Thanks in advance, Ralph [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] simulate data from multinomial distribution with overdispersion
Dear list members, I am searching for a way to simulate data from a multinomial distribution with overdispersion. The data should describe counts of different species under different conditions. Does someone know a way to simulate this or a book or article where I can find informations about this problem? Thanks and greetings, Ralph __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R function which finds confidence interval for binomial variance
Hello Robert, would it be an idea to construct CI's with bootstrap methods? If yes, you can use package boot, based on the book of Davison Hinkley or the package bootstrap, based on the book of Efron Tibshirani. You can put the estimator inside for argument theta. Bests, Ralph Am Thursday 25 September 2008 07:56:56 schrieb Robert A. LaBudde: I need to construct confidence intervals for the binomial variance. This is the usual estimate v = x*(n-x)/n or its unbiased counterpart v' = x*(n-x)/(n-1) where x = binomial number of successes observed in n Bernoulli trials from proportion p. The usual X^2 method for variance confidence intervals will not work, because of the strong non-normal character of the sampling distribution for v (or v'). Does anyone know of an R package with R function that computes a reasonable confidence interval for v or v'? Thanks. Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: [EMAIL PROTECTED] Least Cost Formulations, Ltd.URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239Fax: 757-467-2947 Vere scire est per causas scire __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Graphics winder keeps disappearing!
Hi Lauren, try it with dev.off() before plotting. Perhaps you have an old window or connection open somewhere. Bests, Ralph Am Thursday 25 September 2008 14:24:17 schrieb Gough Lauren: Dear all, I am a very new user to R (for windows) (since Monday!) so please excuse me if I am asking an obvious question! I am experiencing some problems with the graphics window - in short, it keeps disappearing. i.e. I can type x-c(1,3,6,4,9) plot(x) No errors are produced, but not graphics window appears either. The graphics window tends to work if I plot graphs immediately after opening R, but after I have had R open for a while and have run several functions/loaded datasets it stops appearing. Does anyone know why this is, I am a little confused! Many thanks Lauren PhD student School of Geography University Park University of Nottingham NG7 2RD This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] time calculation for simulation
Hello list, I want to compare time needed for a simulation between R and Ra (time optimized loops). Does anybody know, how I can count time needed for a simulation in R? Bests, Ralph __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
