search for: t2n

...2007). This code is meant to examine the problem space given that there is no true difference between the groups (as is the case when both a generated from random draws from the normal distribution). I run an initial number of subjects in two groups (t1N) then, if p is < .25 on the t-test I add t2N more subjects to each group. Then I perform the t.test again. If the p was > .25 at time 1 I stop. Plainp is simply storing the p-values from t2 (if it was performed) or from t1 (if t2 was not performed). In the code I provide t1 starts at 16 since this is about when the problem becomes more fre...

...aid it may also be possible to get the server settings changed depending on what is required (and the implications). Thanks Jim -- James Young, B.Sc. Ph.D. Student Interactions laboratory, Department of Computer Science, University of Calgary 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4 Phone: +1.403.210.9502 E-mail: jim.young@ucalgary.ca URL: http://pages.cpsc.ucalgary.ca/~jyoung/<http://pages.cpsc.ucalgary.ca/%7Ejyoung/>

Hello, Is there any R function which does power calculation for unbalanced groups (n1 neq n2)? Since power.t.test has n Number of observations (per group). Many thanks, Samuel [[alternative HTML version deleted]]

...and would like to compile a standalone EXE (or DLL) for WINNT. Would somebody know how this works or how it could be done ? Thanks so much for any hints and suggestions; best regards F. Falk Huettmann Geography Dept.-Earth Science- 2500 University Drive N.W. University of Calgary Calgary AB, T2N 1N4 CANADA Email: falk at ucalgary.ca Tel. 403 210 5422 (lab) 403 230 3122 (home) Fax 403 282 6561

Hi list, One of my co-workers found this problem with 'cor' in his code and I confirm it too (see below). He's using R 2.2.1 under Win 2K and I'm using R 2.3.0 under Win XP. =========================================== > R.Version() $platform [1] "i386-pc-mingw32" $arch [1] "i386" $os [1] "mingw32" $system [1] "i386, mingw32" $status

...y lost in mbox file /fs205/imap2009/mbox Nov 10 13:27:48 lms2 dovecot: imap2520 [IMAP 10548]: X-IMAPbase uid-last unexpectedly lost in mbox file /fs206/imap2520/mbox -- Kai Wang System Services Information Technologies, University of Calgary, 2500 University Drive, N.W., Calgary, Alberta, Canada T2N 1N4 Phone (403) 220-2423, Fax (403) 282-9361

Hello R-helpers, I am trying to search for string that includes the caret symbol, using the following code: grepl("latitude^2",temp) And R doesn't like that. It gives me: > temp<-c("latitude^2","latitude and latitude^2","longitude^2","longitude and longitude^2") > temp [1] "latitude^2" "latitude and

Hello, I have a doubt in using the function step (step wise) to select glm models. Usually I apply the gamma distribution to analyze fishery data. To select the terms I use a routine where I first compare single term models to the null model (eg. U~1 vs. U~depth; U~1 vs. U~latitude; etc. ? where U= abundance) and, by means of the result given by a likelihook function applied for each comparison,

Hello Using R 2.2.1 on a Windows machine. Has anyone programmed the Welch test for equality of variances? I tried RSiteSearch, but this gave references to t test and oneway.test, which are not quite what I need.....I need the Welch test itself, for use in a meta-analysis (to determine if variances are equal). TIA Peter Peter L. Flom, PhD Assistant Director, Statistics and Data Analysis

Hi all, I'm having trouble getting access to the pwr. This is on Ubuntu Lucid Lynx, 64 bit. I'm installing pwr via packages.install('pwr'), and loading it via library(pwr), both of which appear successful. Strangely, I never get access to the pwr object in R. I tried installing it to /usr/local/lib/R/site-library and ~/R/x86_64-pc-linux-gnu-library. I also tried installing it

Hello all, I have a data file table.txt which i have attached. I am trying to pass the columns as arguments to a function "totnorm" where i am displaying a total normalization plot. The function is given below: totnorm<-function(x,y){scale<-sum(x)/sum(y);xlab<-colnames(x);ylab<-colnames(y);x1<-x[[1]];y1<-scale*y[[1]];plot(x1,y1,xlab=xlab,ylab=ylab,col=6, col.lab=4);}

Hello all, I have a data file table.txt which i have attached. I am trying to pass the columns as arguments to a function "totnorm" where i am displaying a total normalization plot. The function is given below: totnorm<-function(x,y){scale<-sum(x)/sum(y);xlab<-colnames(x);ylab<-colnames(y);x1<-x[[1]];y1<-scale*y[[1]];plot(x1,y1,xlab=xlab,ylab=ylab,col=6, col.lab=4);}

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