similar to: Habituation model

Dear all, I am looking at habituation of dogs trotting on a treadmill. Each record is made of 40 to 50 data for the same variable (for example Peak). I get each record at several minutes (1, 2 and 4) for each session. And I have 4 sessions of training (one session a week). The aim is to study the effect of the factor (Minute) on the Peak variable, and to study the changes of this effect

I might be missing something but I thought that AUC was a measure for comparing ROC curves, so there is nothing else needed to "compare" them. The larger AUC is the higher correlation of 2 variables compared. No other measures or calculations are needed. Jarek Tuszynski -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On

Dear all, I try to compare the performances of several parameters to diagnose lameness in dogs. I have several ROC curves from the same dataset. I plotted the ROC curves and calculated AUC with the ROCR package. I would like to compare the AUC. I used the following program I found on R-help archives : From: Bernardo Rangel Tura Date: Thu 16 Dec 2004 - 07:30:37 EST

Dear R-gurus, I have an interpretation problem regarding lme models. I am currently working on dog locomotion, particularly on some variation factors. I try to figure out which limb out of 2 generated more dispersed data. I record a value called Peak, around 20 times for each limb with a record. I repeat the records during a single day, and on several days. I tried to build two models, one

If you used all 28 animals to find the model out of a group of candidate models, I would have my reservations about this 'validation'. Any confidence intervals you get from the final model are bound to be overly optimistic because you haven't accounted for the degrees of freedom chewed up during the model fitting/finding process. Matt Austin Statistician Amgen One Amgen Center

Dear R users, I would like to calculate a cumulative sum as following: on the i-th row, in the j-th column of a matrix, I would like to obtain the sum of the (i-1) preceding elements of this j-th column. Could I avoid a "for" loop? Thank you, Tristan Lorino ---------------------- ?cole Nationale V?t?rinaire d'Alfort - http://www.vet-alfort.fr, T?l. 01 43 96 70 33 M?l. tlorino at

Dear R users I encounter a problem when i perform a generalized linear mixed model (binary data) with the lmer function (package lme4) with R 2.1.0 on windows XP and the latest version of package "lme4" (0.96-1) and "matrix" (0.96-2) both options "PQL" and "Laplace" for the method argument in lmer function gave me the same results (random and fixed effects

Hi, About GUI and R, I would say that personnaly, I need to build a nice GUI for people who does not know anything about R, to conduct simulations. I don't know if the choice of R is the best. Maybe writing all the code in Java would be better... I don't know. That's why I have tried to install RSJava from Omegahat on my computer (Windows 2000). With R 1.5.0 or 1.5.1, I get the

Hi, I would create a function rdiscrete that returns the value of a discrete random variable X defined on a subset which can change, and for the same probability for the issue, eg: X could sometimes take a value in the subset {2,3,4} with probability 1/3 for each issue, and sometimes X could take a value in the subset {2,3,4,5,6} with probability 1/5 for each issue, etc. The function should have

Hello, Instead of receiving only one message when somebody send a question or a answer, I receive 2 messages with exactly the same contents inside. Is it the same for you? Thank you, Fanny -------------------------- Fanny AZIZA École Nationale Vétérinaire d'Alfort Mail: faziza@vet-alfort.fr Tél. 01 43 96 70 33 [[alternate HTML version deleted]]

Hello R users Would somebody know how to estimate survival from a frailty cox model, using the function survfit and the argument newdata ? (or from any other way that could provide individual expected survival with standard error); Is the problem related to how the random term is included in newdata ? kfitm1 <- coxph(Surv(time,status) ~ age + sex + disease + frailty(id,

Dear R users, Is it possible to install RMySQL package with R 1.5.0 on Windows 2000 platform? This package is not listed in the packages list after calling "load package from CRAN" menu... Thank you for your help, Tristan Lorino ---------------------- ?cole Nationale V?t?rinaire d'Alfort - http://www.vet-alfort.fr, T?l. 01 43 96 70 33 M?l. tlorino at vet-alfort.fr Site personnel

Dear R users, I would like to express a function (with only one argument) as the integrate of its derivate. For example, for y=x^2, I would like something like integrate(deriv(~x^2,"x", function(x) NULL, formal=T),0,2) which would give me... 4. Thank you, Tristan ---------------------- ?cole Nationale V?t?rinaire d'Alfort - http://www.vet-alfort.fr, T?l. 01 43 96 70 33 M?l.

Dear R users, I was happy to find a binary library for SJava in the last released of R (1.5.1)... I am able to load the library... but I have some problems to run this library: > .JavaInit() Error in .JavaInit() : Couldn't start Java Virtual Machine: Can't create Java Virtual Machine > javaConfig() $classPath [1] "F:/Program

Dears users, Thanks for your responses concerning my question of yesterday (about stand-alone package). Il would like to explore two ways: -- Tcltk extension, -- Rweb application. I have installed ActiveTcl (in F:\Tcl), and I have modified the PATH (in the autoexec.bat file): set R_LIBS=F:\R\rw1050\library set PATH=%PATH%;F:\Tcl\bin set PATH=%PATH%;F:\Tcl\lib set PATH=%PATH%;F:\R\rw1050\bin

> Dears users, > I'm trying to run R on a computer with OS X. I installed the R folder > and the dylibs, where they must be installed. I updated my path, and > R runs but tells me : > > dyld: /usr/local/R-1.4.0/lib/R/bin/R.bin version mismatch for > library: /usr/lib/libz.1.dylib (compatibility version of user: 1.1.3 > greater than library's version: 1.0.0)

Dear R users, I'm working with Windows 2000 and R -- note that I could maybe work with Linux too... I would like to know if it is possible to build a stand-alone statistical package which: -- could be programmed in R language, -- could have a nice graphical interface with buttons and menus (this package will be distributed to non-statistician people), -- could realize statistical operations,

Howdy, I''m new to rails and I''m learning form Agile Web Dev with Rails. It seems all of the examples that use form_tag use it in situations where the action first creates a new object before doing a request.post... If I''m in a situation where I''m managing Roles, Rights, and assignments of rights to roles, I may want to have one little form with a text field and

Buenos días a todos: Para empezar, y como este es mi primer mensaje a la lista, me presentaré. Mi nombre es Jorge Tornero y trabajo en el Instituto Español de Oceanografía como Ayudante de Investigación. No soy usuario habitual de R pero estoy tomando contacto con él de cara a un proyecto en el que ando involucrado. Mi consulta es: Me interesaría poder seleccionar columnas de un dataframe,

Estoy trabajando en dos archivos .txt con el comando setdiff. Infortunadamente se me produce un resultado que no he podido controlar a pesar de cargar el comando system("defaults write org.R-project.R force.LANG en_US.UTF-8") para normalizar el sistema UTF-8 [85]"geomorfolog\222a" [91] "habitu\216s" [121] "\352ndice" Mil