[R] Command Line Prompt Symbol

Hi I run R in Windows. Is there a simple way of changing the prompt symbol to, say, R ? (Not just for a temporary session, but every time R command window is opened.) The documentation of doing this is rather sparse. Much appreciated for your assistance. Jacob Jacob L van Wyk Department of

[R] A simple resampling problem

Dear UseRs I would like to show my students how to use resampling to solve the following simple problem: If a family has two children of which one is a boy, what is the probability that the other child is also a boy. The answer is (obviously) 1/3, and can be show easily using the usual

[R] Permutation Distribution

Hallo Is there an elegant way to do the following: Dataset consists of 2 variables: var1: some measurements, and var2: a grouping variable with two values, 1 and 2. There are (say) 10 measurements from group 1 and 15 measurements from group 2. The idea is to study the permutation distribution

[R] Plotting a segmented function

This might be a trivial question, but I would appreciate if anybody could suggest an elegant way of plotting a function such as the following (a simple distribution function): F(x) = 0 if x=0 =(x^2)/2 if 0x=1 =2x-((x^2)/2)-1 if 1x=2 =1 if x2 This is just an example. In this

Re: [R] Locfit package (was Density Estimation)

(1,6)) works for me, and I got there from the help files. On Mon, 13 Mar 2006, Jacob van Wyk wrote: Hallo I am trying to use the package LocFit to follow the example given in an Introductory note of C Loader concerning density estimation. It involves the geyser dataset (107 observations

[R] Density Estimation

Hallo I am trying to use the package LocFit to follow the example given in an Introductory note of C Loader concerning density estimation. It involves the geyser dataset (107 observations on durations, inlc in the package). I have tried the following (using the latest version of R): fit.of -

[R] LocFit

I have a question regarding the package LOCFIT of C Loader. After fitting a smooth surface (y modeled by two regressors), I can't seem to find a nice way of making a perspective (or other 3d plot). The contours don't look quite so good. It is meant to be used as illustration of smoothing to my

[R] Re: Errors in variables

Just a note to thank everybody who responded to my question. Much appreciated! Jacob Jacob L van Wyk Department of Mathematics and Statistics University of Johannesburg APK P O Box 524 Auckland Park 2006 South Africa Tel: +27-11-489-3080 Fax: +27-11-489-2832

[R] Errors in Variables

I hope somebody can help. A student of mine is doing a study on Measurement Error models (errors-in-variables, total least squares, etc.). I have an old reference to a multi archive that contains leiv3: Programs for best line fitting with errors in both coordinates. (The date is October 1989, by

[R] Beginner - simple simulation

Hallo to everybody. I am new to the list and would appreciate some help in a basic first demo of how to use R for simulating a simple game; I would like my students to use R and this may stimulate their interest. The problem is simply: Two players (A and B) play the following game. Each player

[R] Simulation

Hallo all users of R. I wish to simulate a simple linear regression, y=a+bx+e, (n=40, say), where x is N(0,1) and where e is N(0,1), with probability 0.9, and e is 3*(chisq(40,1)-1), say, with probability 0.1. For e: would the following work, or is there a better way? p - rbinom(40,1,0.9) e -

[R] PRESS again

Sorry for the repeat. The PRESS statistic is defined as sum(y-yhat(i))^2, where yhat(i) denotes the ith predicted value using all the data except the ith case (as used typically in linear models). Thanks again Jacob Jacob L van Wyk Department of Mathematics and Statistics Rand Afrikaans