search for: dalgaards

Hi, I just started with R and I found that there are many options to rearrange the data to do mixed models. I want to use the reshape function. I have 2 between subject variables and one within. I was able to change the data structure but still - the result of the aov functions are calculating everything as a within subject. the table looks like this: SerialNo breed treatment distance_1

Dear R-list members, I would like to pose a question about the use and results of the glm() function for logistic regression calculations. The question is based on an example provided on p. 229 in P. Dalgaard, Introductory Statistics with R, 2nd. edition, Springer, 2008. By means of this example, I was trying to practice the different ways of entering data in glm(). In his book, Dalgaard

Full_Name: Stefan Raberger Version: 2.8.1 OS: Windows XP Submission from: (NULL) (213.185.163.242) Hi there, I recently noticed some strange behaviour of the command "type.convert", depending on the startup mode used. But there also seems to be different behaviour on different PCs (all running the same OS and the same version of R). On PC1: When I start R in SDI mode (RGui --no-save

Dear List, Does anyone know when will be available Peter Dalgaard's book: "Introductory Statistics with R" ?. According to Amazon: "This item will be published on August 15, 2002", but it continues unpublised. Thanks, Carlos Ortega. _______________________________________________________________ Yahoo! Messenger Nueva versi?n: Webcam, voz, y mucho m?s ?Gratis!

The following can't be right, first rw2010: > 1 %% 0.001 [1] 0.001 Then rw2001: > 1 %% 0.001 [1] -2.081668e-17 > and the last seems about right. -- Kjetil Halvorsen. Peace is the most effective weapon of mass construction. -- Mahdi Elmandjra -- No virus found in this outgoing message. Checked by AVG Anti-Virus.

Hi, I'm going through the book "Introductory Statistics with R" by Dalgaard to teach myself R. At the end of each chapter there are some exercises. Does anyone know of any place on the net where someone has posted the answers to these? I've looked at the author's and the publisher's site with no luck. And no, this is not cheating for a class, I graduated several

Hi all, Does anyone know a solution for this error ? > tkwidget(dlg, "iwidgets::spinint", range="{0 23}") Error in structure(.External("dotTclObjv", objv, PACKAGE = "tcltk"), class = "tclObj") : [tcl] wrong # args: should be ".31.1.19 configure -range {begin end}". Thanks, Matthew [[alternative HTML version

In this connection, note the following > a4 <- 4 > plotThis <- bquote(alpha==.(a), list(a=a4)) > do.call(plot, list(1:10, main=do.call(expression, c(plotThis)))) > do.call(plot, list(1:10, main=do.call(expression, plotThis))) Error in do.call(expression, plotThis) : second argument must be a list > ## Whereas plotThis has class "call", c(plotThis) has class

Hello, I'm trying to plot a fitted lm() line on a plot when the one explanatory variable is log transformed and log="x". I get different lines using abline and predict.lm(). #Example x <- 1:100 y <- rnorm(100) plot(y ~ x, log="x") abline(lm(y ~ log(x))) lines(x, predict(lm(y ~ log(x))), lwd=2) I'm sure I'm missing something but could someone tell me which

Full_Name: Derek Elmerick Version: 2.4.0 OS: Windows XP Submission from: (NULL) (38.117.162.243) hello - i have some code that i run regularly using R version 2.3.x . the final step of the code is to build a multinomial logit model. the dataset is large; however, i have not had issues in the past. i just installed the 2.4.0 version of R and now have memory allocation issues. to verify, i ran

Does anyone know of a resource for learning the basics of how to manage and manipulate dates and times in R? I have been reading "Introductory Statistics with R" by Peter Dalgaard which is fantastic. But alas, I could find no reference to date and time. I have looked at the reference manual but it is particularly unapproachable. So rather than dense technical talk I would rather see a

The first issue of the second volume of The R Journal will shortly be available at journal at r-project.org/current.html. Thanks to everyone involved. Peter Dalgaard Editor-in-chief -- Peter Dalgaard Center for Statistics, Copenhagen Business School Phone: (+45)38153501 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com _______________________________________________ R-announce at

The first issue of the second volume of The R Journal will shortly be available at journal at r-project.org/current.html. Thanks to everyone involved. Peter Dalgaard Editor-in-chief -- Peter Dalgaard Center for Statistics, Copenhagen Business School Phone: (+45)38153501 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com _______________________________________________ R-announce at

Hello, I use t.test for normal distributed and wilcox.test for non-normal distributed samples. It is easy to write a function for t.test that calculates the effect size, because all parts of the formula are available from the t.test result: r = sqrt(t*t / (t*t + df)) However, for Wilcoxon tests, the formula for effect sizes is: r = Z / sqrt(N) I wonder how I can calculate the Z-score in R for

The current development version dies in qbeta() when compiled with egcs -O, egcs 1.0.2 and glibc 2.0.7 (RedHat versions). Since this also kill the F and t distributions, it doesn't exactly do wonders for R's usefulness... Anyone else seeing this or has my setup just gone out of whack? It does look pretty much like a clear compiler bug when inlining math functions (storing temporaries

Dear R users,   I need to do a F test on the hypothesis that a 2 by 1 vector (X_1, X_2)' has the mean vector  (M_1, M_2)'. Specifically, I would like to assume the X vector comes from a bivariate Normal distribution (M, Sigma). Then, given 1000 observations on X, I wanted to test if the means of X agree with the means of the target Normal distribution. Any function or package in R could do

Dear Peter, thank you very much for your answer. My problem is that I need to calculate the following quantity: solve(chol(A)%*%Y) Y is a 3*3 diagonal matrix and A is a 3*3 matrix. Unfortunately one eigenvalue of A is negative. I can anyway take the square root of A but when I multiply it by Y, the imaginary part of the square root of A is dropped, and I do not get the right answer. I tried

Hello, Peter, I tried it out: iconv(names(attributes(spss[,'Y6'])[[1]][14]), "UTF-8", "LATIN1", sub='byte') yielded [1] "<c4>rzte Chirurgie" and c4 corresponds in most encodings to ?. What can I do next? I wonder whether there is a more comfortable way then to change the occurences of <..> by the adequate character. Regards, Matthias

I did not realize that ++ was available. Is there a comprehensive list somewhere of which operators are available for definition? I searched the R Language manual for ++ but that only came up with a reference to C++ . On 17 Nov 2006 11:38:43 +0100, Peter Dalgaard <p.dalgaard at biostat.ku.dk> wrote: > rfrancois at mango-solutions.com writes: > > > Hi, > > > > You

Hello all: Why arbitrage rarely works. Peter Dalgaard's "Introductory Statistics with R" sells on AMAZON U.S. website at USD 44.95 and on AMAZON U.K at GBP 21.00. At the current exchange rate, the U.K. price translates to USD 32.68, a 27% savings BUT for delivery: the U.S. AMAZON promises 6-10 days whereas in the U.K. 4-6 weeks is promised. At Springer http://www.springer.de the