similar to: Function recommendation for this study...

Hi! I have some data that looks like this up down percentaje uew_21 20 14 58.82 uew_20_5 27 40 40.29 uew_20 8 13 38.09 uew_19_5 17 42 28.81 So I have 4 experimental conditions and I am counting number of animals in the up and down compartment and the calculating the percentage, I want to know which one of the conditions is different from each other. If the data wouldn't be percentage

Hi! I'm comparing the differences in contaminant concentration between 2 different groups of people ( N=36, N=37). When using a simple linear regression model I found no differences between groups, but when evaluating the diagnostic plots of the residuals I found my independent variable to have deviations from normality (even after log transformation). Therefore I have used bootstrap on

Hi all, I have a dataset which consists of 2 columns. I'd like to plot them on a x-y scatter plot and fit an exponential trendline. I'd like R to determine the equation for the trendline and display it on the graph. Since I am new to R (and statistics), any advice on how to achieve this will be greatly appreciated. Many thanks, Chris -- View this message in context:

Dear All, I am new to R and slowly learning how to use the system. The following code is an exercise I was trying. The intent is to generate 10 random samples of size 5 from a vector with integers 1:10 and 2 missing values. I then want to generate a matrix, for each sample which shows the frequency of missing values (NA) in each sample. My solution, using sapply is at the end. If anyone has the

Hi All, I downloaded the R program (version 2.6.2) in last Jan 2008. I now want to upgrade the program to its latest version, but I don't want to go through the process of deleting the existing version and downloading the new version. This is because my existing R program has numerous packages that I downloaded for my research work. I want to upgrade my R program with those packages in it. Is

I am working on a project that requires me to do very large factorial evaluations. On R the built in factorial function and the one I created both are not able to do factorials over 170. The first gives an error and mine return Inf. Is there a way to have R do these larger calculations (the calculator in accessories can do 10000 factorial and Maple can do even larger) -- View this message in

I have a few hundred files of formatted data. Unfortunately most of them end with a spurious CONTROL-Z. I want to rewrite the files without the spurious character. Here's what I've come up with so far, but my code is unsafe because it assumes without justification that the last row of df contains a control character (and some NAs to fill up the record). options(warn=-1) #turn off

I'm sure there is a more general way to ask this question but how do you use the elements of a character vector as names of objects in an expression? For example, say you have: a = c(1,3,5,7) b = c(2,4,6,8) n=c("a","b") and you want to use the names a and b in a function (e.g. sum) sum(eval(as.name(n[1])),eval(as.name(n[2]))) works but what is a simpler way to

Quick question: Which function do you use to calculate partial derivatives from a model equation? I've looked at deriv(), but think it gives derivatives, not partial derivatives. Of course my equation isn't this simple, but as an example, I'm looking for something that let's you control whether it's a partial or not, such as: somefunction(y~a+bx, with respect to x,

Hi all, I feel very comfortable with R in Windows, and am trying to switch over to Linux. I have R 2.8.1 on Linux and it works great (so far), except for instalilng/updating packages. For example, using Emacs with ESS as a text editor, I entered: > update.packages() Here are some error messages: /usr/lib/R/bin/INSTALL: 1088: cannot create /usr/share/R/doc/html/search/index.txt: Permission

There are multiple marketing models in place to predict individual-level probabilities of whether or not someone would respond to a solicitation, whether or not they would become a customer, and if they did become a customer, how much money the company is likely to make. Each individual receives a score from each model, and the final goal is to rank all individuals based on a final score. As

Hi, I am plotting scatterplots of horsepower by torque, conditional on brand (I'm just making up the variables for this example), and the goal is to see both the scatterplot points as well as the smoothed line. When I do the following code, I get the same color for the points and line, and would like the colors to be different, such as black points and a red smoothed line. How do I do that?

This weekend I noticed that my R2WinBUGS connection was no longer working on my Windows computer at work AND my Ubuntu linux computer at home. As soon as WinBUGS opens, the message reads Index Out Of Range. I have un-installed and re-installed R on both computers and the problem remains the same. At first I thought it was the new version of R, but I was able to overcome the problem (on Windows

Hi. I'm going to introduce the R-package for a group of medical doctors later this week and is a little confused about there use of a test named "willcoxon-pratt" for testing if the clinical and biochemical markers has decreased significantly after the use of some drugs for a group of patients. Looking into the R-functions I would in R recommand using a matched-pairs Wilcoxon

I have tried to install the "genetics" package and am getting and error. The log is below. For information, I am using R 2.10.1 on the Windows XP operating system. The mirror site I'm using is Michigan Technological University. Your help in this matter will be greatly appreciated. Murray M Cooper, PhD Richland Statistics 9800 North 24th St Richland, MI, USA 49083

On Tue, Feb 17, 2015 at 12:47 PM, Marc Dietrich <marvin24 at gmx.de> wrote: > Am Dienstag, 17. Februar 2015, 12:42:00 schrieb Sedat Dilek: >> On Tue, Feb 17, 2015 at 12:38 PM, Marc Dietrich <marvin24 at gmx.de> wrote: >> > Am Dienstag, 17. Februar 2015, 11:58:06 schrieb Sedat Dilek: >> >> On Tue, Feb 17, 2015 at 10:40 AM, Marc Dietrich <marvin24 at

There is certainly a trivial solution for my question, but I can't find the answer in the documentation. I need a platform independent method to obtain the file path of the current R script. My working group uses R on several machines with different operating systems including Mac OS X, Windows and Linux, and for obvious reasons the file hierarchies are very different. Therefore, it

Dear All, I came across a really strange behaviour when using winbind on solaris 8. Normally "nscd" should be turned off because it's causing problems in the username resolution etc. When I turn it off I can login e.g. using ssh as an AD users but when i start a command like "ls" it gets put in the background immediately? When "nscd" is turn on and login again I

Dear helpeRs, a colleague of mine would like to give R a try. He uses econometric models which typically involve a large number of variables, esp. time series. Having no experience with handling very large data sets myself I turn to you. 1. Could you please describe your experiences to cope with these situations? 2. What kind of difficulties will he have to face? Are there special

I found the following strange behavior using qnorm() and pnorm(): > x<-8.21;x-qnorm(pnorm(x)) [1] 0.0004638484 > x<-8.22;x-qnorm(pnorm(x)) [1] 0.01046385 > x<-8.23;x-qnorm(pnorm(x)) [1] 0.02046385 > x<-8.24;x-qnorm(pnorm(x)) [1] 0.03046385 > x<-8.25;x-qnorm(pnorm(x)) [1] 0.04046385 > x<-8.26;x-qnorm(pnorm(x)) [1] 0.05046385 > x<-8.27;x-qnorm(pnorm(x))