[R] Statistical Computing & Graphics Student Paper Competition 2017

s/student/faq.html> and <https://www.amstat.org/ASA/Your-Career/Student-Paper-Competitions.aspx>. Inquiries and application materials should be sent to: Patrick Breheny Department of Biostatistics University of Iowa patrick-breh...@uiowa.edu

[R] John M. Chambers Statistical Software Award

the awards. Inquiries and application materials should be sent to: Patrick Breheny Department of Biostatistics University of Iowa patrick-breh...@uiowa.edu __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman

[R] ASA Statistical Computing & Graphics Student Paper Competition 2016

.amstat.org/sections/studentpaperawards.cfm as well as the website of the Statistical Computing Section: http://stat-computing.org/awards/ Inquiries and application materials should be emailed to: Student Paper Competition Patrick Breheny patrick-breh...@uiowa.edu -- Patrick Breheny Assistant Pro

[R] ASA Statistical Computing & Statistical Graphics Award

maximum of four supporting letters, each no longer than two pages Nominations and questions should be sent to the Awards Chair of the Statistical Computing Section at the e-mail address below. Patrick Breheny Department of Biostatistics University of Iowa patrick-breh...@uiowa.edu -- Patri

[R] John M. Chambers Statistical Software Award

tings. Patrick Breheny Department of Biostatistics University of Iowa patrick-breh...@uiowa.edu -- Patrick Breheny Assistant Professor Department of Biostatistics University of Iowa N336 College of Public Health Building 319-384-1584 __ R-help@r-projec

[R] John M. Chambers Statistical Software Award

, and the winner(s) will be given an opportunity to present their work in a topic-contributed session at the meetings. Patrick Breheny Department of Biostatistics University of Iowa patrick-breh...@uiowa.edu -- Patrick Breheny Assistant Professor Department of Biostatistics University of Iowa

Re: [R] Overlapping x axes using Lattice

The scales argument in lattice controls the appearance of the axes. It consists of two lists, one for the x axis and one for the y axis. For example: histogram(~pesti[,1]|pesti[,2]+ pesti[,3],scales=list(x=list(at=c(2,6),labels=c("First","Second" This allows you to place the labels whe

Re: [R] first occurrence of a value?

2 2 2 1 NA _______ Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky On 05/04/2011 07:52 AM, Albert-Jan Roskam wrote: Hello, A simple question perhaps, but how do I, within each row, find the first occurence of th

Re: [R] create a folder with mode '0777'

. In other words, this is a linux issue, not an R issue -- the same thing happens when you use mkdir. This can be overridden, however. For example, system("chmod -R 0777 test") which recursively changes the mode of test and all its subdirectories from within R. _____

Re: [R] Box-Cox transformation in R

. ___ Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R

Re: [R] Recursive Indexing Failed

ance for your help Best Regards Alex ___________ Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-

Re: [R] Recursive Indexing Failed

;))) sapply(x,'[[',"Two") [,1] [,2] [1,] "b" "e" [2,] "c" "f" In your example, it seems sapply(CRagentInTime[[1]][[2]],'[[',"sr") would work, but I am not in a position to replicate your code, as is it not s

Re: [R] Recursive Indexing Failed

x[[1]][[2]], not c(x[[1]], x[[2]]). Thank you for the clarification; I stand corrected. ___ Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org ma

Re: [R] Simple order() data frame question.

E),] aa bb 10 j -2.21178676 9 i -0.52119533 8 h 0.80990322 7 g 2.44362935 6 f 3.16449690 5 e -0.33932586 4 d -0.86918700 3 c -1.86750927 2 b -0.65623164 1 a 0.06365513 The expression 'df1[,-2]' removes the second column from df1; clearly not what you

Re: [R] Questions regrading the lasso and glmnet

You have 5 variables. Variable selection is not your goal. What you are trying to do is fit a curve (as opposed to a line) through your data, along possibly with interactions. I would suggest looking into splines, provided for example in the mgcv package. -- Patrick Breheny Assistant Prof

Re: [R] dynamic programming

go into greater detail about what you are trying to accomplish with this line of code. Also, probably not a good idea to have a variable called 'c', as this is bound to lead to confusion with the function for combining objects, 'c()'. -- Patrick Breheny Assistant

Re: [R] based on mean and std

You could try: f <- function(x){pnorm(x,mean=10,sd=20)} curve(f,from=-10,to=30) Or: x <- seq(-10,30,len=101) y <- pnorm(x,mean=10,sd=20) plot(x,y,type="l") -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky

Re: [R] [Plea to the R Gods] Theoretical and Empirical CDFs

comparison: plot(ecdf(x),add=TRUE,do.points=FALSE,verticals=TRUE) Please be aware, however, that density estimation is a complicated topic with an extensive literature. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics Univer

Re: [R] limma contrast matrix

ou take the advice of point 1) and put an intercept in your model. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/list

Re: [R] glmnet

On 08/10/2011 03:00 AM, Nick Sabbe wrote: Finally, to avoid downward bias, you could run a normal glm with only the variables selected in the previous step. At the cost, of course, of introducing upward bias -- Patrick Breheny Assistant Professor Department of Biostatistics Department of

Re: [R] studentized and standarized residuals

;externally studentized residuals"). There is a closed form expression, but it is somewhat bulky. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing lis

Re: [R] Cv.glment question -- why giving me an error

ot have an observation in each class in each fold. It would be rather difficult to estimate the probability of belonging to a class without any data. 2) Do you really hope to obtain a meaningful fit for a multinomial model with only 8 observations? How many classes do you have? -- Patri

Re: [R] How would you calculate this type of p-value using R?

#x27;p-value' would simply be the fraction of cases in your sample as large or larger than the observation in question. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R

Re: [R] Question about BIC of two different regression models? how should we compare two regression models?

On 09/02/2011 08:48 AM, John Sorkin wrote: I believe when using BIC one needs to compare nested models This is wrong. Hypothesis tests rely on nested models; information criteria do not. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University

Re: [R] Question about BIC of two different regression models? how should we compare two regression models?

; my remark was only meant to refer to the simple case of logistic regression in the original post, and certainly should not be construed as a blanket statement applying to all possible hypothesis tests of all possible models. -- Patrick Breheny Assistant Professor Department of Biostatistics

Re: [R] misclassification rate

tion rate is > 1-sum(diag(tab))/sum(tab) [1] 0.54 -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLE

Re: [R] generate randomly a value of a vector

m is the number of random vectors you wish to generate in this manner. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman

Re: [R] Force regression line to a 1:1 relationship

y~X) plot(fit) The latter type of plot is called a "partial regression plot" or "added variable plot". They are discussed in any regression textbook, as well as wikipedia and probably dozens of other web sites. -- Patrick Breheny Assistant Professor Department of Bios

Re: [R] Force regression line to a 1:1 relationship

On 09/14/2011 11:36 AM, David Winsemius wrote: On Sep 14, 2011, at 10:52 AM, Patrick Breheny wrote: The latter type of plot is called a "partial regression plot" or "added variable plot". They are discussed in any regression textbook, as well as wikipedia and probably dozen

Re: [R] working with sparse matrix

matrices, this and other operations will be faster if the matrix is explicitly stored as a sparse matrix, as implemented in the 'Matrix' package. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky _

Re: [R] FW: lasso regression

isting of only the first 8 observations, then all the columns. Perhaps you mean: X <- crs[,1:8] y <- crs[,9] If this is not the case, please include the output of head(crs) and then tell us which variable is your response. -- Patrick Breheny Assistant Professor Department of B

Re: [R] glmnet with binary logistic regression

ger than usual? If so, and you suspect a problem with the way that glmnet is partitioning the data set into cross-validation folds, you can specify that with the 'foldid' option. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics Univ

Re: [R] glmnet with binary logistic regression

putational convenience when n is large, which is not a large problem in your case. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __ R-help@r-project.org mailing list https://stat.ethz.

Re: [R] Fisher Exact Test

threshold. Am I running my code wrong? Your code is fine; your conclusion is valid (assuming you mean "...better than site 1..."). -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky ___

Re: [R] logistic regression - glm.fit: fitted probabilities numerically 0 or 1 occurred

is leading to the fitted probabilities near 0 and 1 you are observing (note that only 0.1% of the data is in region 4 above, although region 4 accounts for 99.1% of the range of x). -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky

Re: [R] varaince explined of a regression tree using ctree

ulate: X <- matrix(rnorm(100*10),ncol=10) y <- X%*%c(rep(2,5),rep(0,5))+rnorm(100) fit <- ctree(y~.,data=as.data.frame(X)) r <- y - predict(fit) 1-var(r)/var(y) -- Patrick Breheny Assistant Professor Department of Biostatistics Department of S

Re: [R] binomial logistic regression question

glm<- glm(cbind(SUCCESSESS,TRIALS) ~ INDEP1 + INDEP2 + INDEP3, data = data,family = binomial) as is specified in the details of ?glm. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky __

Re: [R] GAM

onus only has 7 unique values. Claims does not pose any problem, as it has 98 unique values. As Jean suggested, you can get around this issue with: amgam<- gam(log(Payment) ~ offset(log(Insured)) + s(as.numeric(Kilometres),k=5) + s(Bonus,k=7) + Make + s(Claims),family = gaussian, dat

Re: [R] gam - Y axis probability scale with confidence/error lines

it object so I can do 'stuff' with it? Thanks, Ben PS - thank you Patrick for your help previously. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read th

Re: [R] gam - Y axis probability scale with confidence/error lines

fit-1.96*pred$se.fit) u <- binomial()$linkinv(pred$fit+1.96*pred$se.fit) plot(x,yy,type="l") lines(x,l,lty=2) lines(x,u,lty=2) -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky On 03/14/2012 01:49 PM, Ben quant wrote:

Re: [R] Metropolis-Hastings in R

repeatedly manipulate it as though its rows are scalars * you're missing a negative in the normal likelihood. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky On 03/14/2012 01:21 PM, Michael Williams wrote: Hi all, I'm

Re: [R] Graphic legend with mathematical symbol, numeric variable and character variable

There are a few different ways to do this; see the examples in ?plotmath under the heading "How to combine 'math' and numeric variables". -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky On 03/20/2012 09:09

Re: [R] cv.glmnet

ot believe that is possible with the current implementation of glmnet. The glmnet() function includes an intercept by default and there are no options which allow the user to change this. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University o

Re: [R] glmnet() vs. lars()

, it is impossible to know in advance how fine the grid must be in order to ensure that only one variable enters the model between any two consecutive lambda values. -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Statistics University of Kentucky _

Re: [R] CI for the median difference

, but not for the median: A =c(619, 600, 490, 1076, 654, 955, 563, 955, 827, 873, 1253) B =c(346, 507, 598, 228, 576, 338, 1153, 354, 560, 517, 381) > median(A)-median(B) [1] 320 > median(A-B) [1] 273 -- Patrick Breheny Assistant Professor Department of Biostatistics Department of Stat

Re: [R] Week number from a date

To give a little more detail, you can convert your character strings into POSIX objects, then extract from it virtually anything you would want using strftime. In particular, %W is how you get the week number: > dateRange <- c("2008-10-01","2008-12-01") > x <- as.POSIXlt(dateRange) > strftime(