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Dear R users, I want to generate two random variables (X1, X2) from uniform distribution (-0.5, 0.5) with a specified correlation coefficient r. Does anyone know how to do it in R? Many thanks! Menghui

Hello, I'm new to this and am trying to teach myself some R by plotting biological data. The growth curve in question is supposed to be fitted to the Verhulst equation, which may be transcribed as follows: f(x)=a/(1+((a-0.008)/0.008)*exp(-(b*x))) - for a known population density (0.008) at t(0). I am trying to rework the example from "An Introduction to R" (p. 72) for my case and

Hi all, for example: > X<- rnorm(1000) > X0 <- 0.899 I want to draw a density distribution plot with a arrow pointer indicating the position of X0, meanwhile, giving out the p-value. any functions? Thanks very much.

Hi All, I am currently preparing some form of slideshow introducing R and its capabilities for some colleagues. The thing will be about 30 mins, and I'd like to have some "pretty pictures" and some "amazing facts" (I'm trying to sell, obviously :)). Can I ask if it's possible to easily retrieve a gross figure of the number of functions in R considering the

...'m trying to find pairwise regression in order to > find each bi. Can anyone hlep? Thanks so much in > advance. > > franc > > > > ------------------------------ > > Message: 84 > Date: Thu, 26 Aug 2004 19:42:35 -0400 > From: "Jim Brennan" <jfbrennan at rogers.com> > Subject: Re: [R] Surprise when mapping matrix to image > To: <rossini at u.washington.edu>, <r-help at stat.math.ethz.ch> > Message-ID: > <014201c48bc6$5e03a860$3b8ac445 at slnt.phub.net.cable.rogers.com> > Content-Type: text/plain; charset=&quo...

I am curious as to why I quite often receive responses to questions on the help before receiving the actual question. For example Mr Graves has responded to Mr Lumley's response to Mr Wegelin yet I ave not received Mr. Lumley's post while I have received the other two. Cheers, Jim [[alternative HTML version deleted]]