search for: saschaview

...Will both samples, X and Y, be "absolutely" random or will they have systematic differences? And: Should I sort or shuffle a vector before sampling? Thank you, *S* x <- as.factor(LETTERS[sequence(10:1)]) y <- sort(x) X <- sample(x, 5) Y <- sample(y, 5) -- Sascha Vieweg, saschaview at gmail.com

...me with 4 variables (and the id) of the 5 persons: id v1 v2 v3 v4 1 1 6 21 36 51 2 2 7 22 37 52 3 3 8 23 38 53 4 4 9 24 39 54 5 5 10 25 40 55 Currently, I do this in a loop, but I was wondering about a quick and ressource-friendly way to achieve this? Thanks *S* -- Sascha Vieweg, saschaview at gmail.com

...am looking for an elegant one-liner for the following operation: x <- rnorm(10) y <- runif(10) c(mean(x)-mean(y), mean(x)+mean(y)) I thought about apply(data.frame(x, y), 2, mean) but I don't know how to apply the +- operation on the result of apply. Thanks, *S* -- Sascha Vieweg, saschaview at gmail.com

...xt files. Besides Emacs and the R built-in editor, could you recommend a good editor for Windows, even some commmercial for a small price? (For a comparison, TextMate for OS X is 35 USD and does a great job on all plain text and code related issues, not only R.) Thanks, *S* -- Sascha Vieweg, saschaview at gmail.com

...indication which column differs from others significantly? Bortz, Lienert, Boehnke (2008). Verteilungsfreie Methoden in der Biostatistik. Berlin: Springer K?hler, Schachtel, Voleske (2007). Biostatistik: Eine Einf?hrung f?r Biologen und Agrarwissenschaftler. Berlin: Springer -- Sascha Vieweg, saschaview at gmail.com

...sample( c(1:3, 1:3, 1:3, NA), 7000, repl=TRUE ), ncol=35, dimnames=list(NULL, paste('V', 11:45, sep="") ) ) ) md.pattern(x) # Warning message: In md.pattern(x) : NAs introduced by coercion md.pattern(x[, 1:31]) # fine Thanks, *S* -- Sascha Vieweg, saschaview at gmail.com

...BMW Mercedes VW Skoda 1 T F F F 2 F T T F 3 T F T T 4 F F F F 5 F F T T My idea was to first find all levels by: v <- unique(unlist(lapply(x, levels))) But then I am stuck. Thanks for help, *S* -- Sascha Vieweg, saschaview at gmail.com

...o not know what the difference between the residual deviance of the former (binary) and the latter (multinomial) model is. (I need the deviances to calculate some of the pseudo R-squares with function pR2(), package "pscl".) Could you give good advice? Thanks *S* -- Sascha Vieweg, saschaview at gmail.com

Hi there, I have a numeric vector let say: Vect <- c(12.234, 234.5675, 1.5) Now I want a string vector like: changedVec <- c("012.234", "234.568", "001.500") Would be grateful if somebody help me how can I do that. Thanks and regards, [[alternative HTML version deleted]]

...le="Condition:", cex=.8 ) I like to produce this plot with package "ggplot2", but I have just discovered it and don't know where to start. It would be great if somebody could give me a starting point with code for that particular task. Thanks, *S* -- Sascha Vieweg, saschaview at gmail.com

...replace=T) m <- update(b.mod, . ~ ., data=df[l, ], trace=F) c.mat.1[i, ] <- coef(m)[1, ] c.mat.2[i, ] <- coef(m)[2, ] i <- i + 1 } (coefs1 <- apply(c.mat.1, 2, mean)) (coefs2 <- apply(c.mat.2, 2, mean)) summary(predict(b.mod)==model.frame(b.mod)$y) -- Sascha Vieweg, saschaview at gmail.com

...ges and/or disadvantages of 'boot()' over my loop? (3) Can I in principle use 'boot()' to return all of the 100 different data vectors used in the loop, or does 'boot()' by default return already-calculated statistics? Thanks for hints and help, *S* -- Sascha Vieweg, saschaview at gmail.com

Hello I am trying to solve these problems and I am not allowed to use loops or ifs. 1st Question My first question is that I have generated 100 random numbers from the uniform distribution then A)add only the negative integers. B)add elements until the first appearance of a negative element. I know how to choose the negative elements for A but how to find integers? And I dont know what to do

Hello I am trying to solve these problems and I am not allowed to use loops or ifs. 1st Question My first question is that I have generated 100 random numbers from the uniform distribution then A)add only the negative integers. B)add elements until the first appearance of a negative element. I know how to choose the negative elements for A but how to find integers? And I dont know what to do

...robstring) dev.off() ?Cairo suggests encoding is ignored if you do try to set it. cheers Ben On 14/01/2011, at 7:00 PM, r-help-request at r-project.org wrote: > Date: Thu, 13 Jan 2011 10:47:09 -0500 > From: David Winsemius <dwinsemius at comcast.net> > To: Sascha Vieweg <saschaview at gmail.com> > Cc: r-help at r-project.org > Subject: Re: [R] unicode&pdf font problem RESOLVED > Message-ID: <74FA099F-4CE5-45C7-A05A-4A1DE6C87EC8 at comcast.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed; delsp=yes > > > On Jan 13, 2011, at...

...the default indent of inner lines is 4 spaces (plus the prompt). How can I change that default to 2 spaces? I tried to adjust my Sweave.sty with the option tabsize but that doesn't show an effect. Also the Sweave documentation did not provide a cue. Thanks for hints, *S* -- Sascha Vieweg, saschaview at gmail.com

how do I create a data frame with the given column names _NOT KNOWN IN ADVANCE_? i.e., I have a vector of strings for names and I want to get an _EMPTY_ data frame with these column names. is it at all possible? -- Sam Steingold (http://sds.podval.org/) on CentOS release 5.3 (Final) http://openvotingconsortium.org http://pmw.org.il http://memri.org http://mideasttruth.com

...t is the fastest code to perfom the forestanding operation? (2) Is there a more general function for tasks like this, not only with the sum procedure applied to the vector? Specifically, the zeros in the matrix may cause problems with other operations than sum. Thanks, *S* -- Sascha Vieweg, saschaview at gmail.com

I am looping through various models with different combinations of independent variables which are stored as columns in x glm(y ~ ??, data=x) How can I pass the colnames of the selected columns of x into ?? seperating them with a + ie I want to generate glm(y ~ x1 + x2, data=x) glm(y ~ x2 + x3, data=x) glm(y ~ x1 + x2 + x4, data=x) ... I have tried the sedit function

...e.g. the list stats-discuss (which failed to load), and the newsgroups sci.stat.consult and sci.stat.edu. However, before stumbling around, could you give a good recommendation on a mailing list or newsgroup appropriate for such issues? Thanks for your tips. Regards, *S* -- Sascha Vieweg, saschaview at gmail.com