similar to: The use of F for False and T for True

Monte, For a list of online sources that may be useful, go to http://www.uvm.edu/~dhowell/methods/Websites/Archives.html and check out some of the material referenced there. Clay Helberg's site is particularly helpful. Unfortunately it is virtually impossible to keep links current, so some are likely to be dead--although you can often find them via Google. Dave Howell -- David C. Howell

I am writing a resampling program for multiple regression using lm(). I resample the data 10,000 times, each time extracting the regression coefficients. At present I extract the individual regression coefficients using brg = lm(Newdv~Teach + Exam + Knowledge + Grade + Enroll) bcoef[i,] = brg$coef This works fine. But now I want to extract the t tests on these coefficients. I cannot

Dear all, I am perplexed when trying to get the same results using pairwise.t.test and t.test. I'm using examples in the ISwR library, >attach(red.cell.folate) I can get the same result for pairwise.t.test and t.test when I set the variances to be non-equal, but not when they are assumed to be equal. Can anyone explain the differences, or what I'm doing wrong? Here's an example

I have been having problems with using scan(). I searched the archives and found someone with the same problem several years ago, but did not find a solution. I want to prompt the user for input, scan in that input, and then go on to use it as a variable. The simplest version of my program is cat("enter m","\n") m <- scan(n = 1, quiet = T) m If I enter these lines one

'Writing R Extensions' tells you that $ needs to be escaped in Rd files outside \code and similar. So I was surprised to find that ca 80 CRAN packages have constructions like (from ISwR) \item{\code{folate}}{ a numeric vector, folate concentration ($\mu$g/l). } This does not render sensibly in non-latex conversions, and it is what we have \eqn{} for. That $ needs to be

Hi, I am getting some strange results using round - it seems that it depends if the number before the decimal point is odd or even .... For example: > round(1.5)[1] 2> round(2.5)[1] 2 While i would expect that round(2.5) be 3 and not 2. Do you have any explanation for that? I really appreciate your input, Monica

Dear R user I have 2 problems with lmer. The statistical consultance service of my university has recomended to me to expose those problems here. Sorry for this quite long message. Your help will be greatly appreciated... Gilles San Martin 1) anova() I fit a first model : model1 <- lmer(eclw~1 + density + landsc + temp + landsc:temp + (1|region) + (1|region:pop) + (1|region:pop:family),

Hi All, I am struggling for 2 weeks solving authentication problem in dovecot. logs from /etc/mail/maillog Oct 15 18:00:35 localhost dovecot: auth: Debug: Loading modules from directory: /usr/lib64/dovecot/auth Oct 15 18:00:35 localhost dovecot: auth: Debug: Module loaded: /usr/lib64/dovecot/auth/libauthdb_ldap.so Oct 15 18:00:35 localhost dovecot: auth: Debug: Module loaded:

Hello everybody, I use the sweetpotato database included in R package: data(sweetpotato) This dataset contains two variables: yield(continous variable) and virus(factor variable). Due to Levene test is significant I cannot assume homogeneity of variances and I apply Welch test in R instead of one-way ANOVA followed by Tukey posthoc. Nevertheless, the problems come from when I apply posthoc

Dear R News, I am inquiring whether the articles that are published in the 'R News' have undergone a peer-review/refereeing process, for the purpose of reporting the academics publications here at the University of Sydney to the Australian Government. Thank you for your assistance. Regards Glenn Glenn Howell| Faculty Research Assistant FACULTY OF ECONOMICS AND BUSINESS

Because of space limitations and because of the location of the punch-down blocks, my * server is located on the shelf in a coat closet. Sadly, there is not enough space (or ventilation) for the monitor and keyboard. This will all change when we move to new quarters, but... Does anyone have experience running Linux/Asterisk without a monitor? What, if any, are the issues? TIA

Hello all, I know I need to read the manual but I don't even know where I need to look in the manual. I'm haveing a little bit of a problem getting XP to print to my linux printer. I've got the smb.conf file set up to allow xp to access the corect share and it even sees the printer but it apears it doesn't have permision to print to it. What might I need to do to

Hi all, I have an i7-3770 which has the Intel HD 4000 graphics. I''ve been trying to pass it through to DomU with no success. With a Linux DomU, the i915 module simply will not load because intel_agp is not loaded properly when it cannot find the AGP bridge. ( With a Win7 DomU, it BSODs straight away during the boot with SYSTEM_SERVICE_EXCEPTION. With a WinXP DomU, it got further

Hi all, I''ve got a couple of questions regarding the current status of nvidia with Xen, since it is well known that nvidia doesn''t work as smooth at the moment with Xen (comparing to ati). My current goal is to use one nvidia gtx460 card and the onboard intel hd4000 on dom0, and then do passthrough for another nvidia gtx460 to a Windows domU. I know there are patches

Hello, I have some patient data for my masters thesis with three groups (n=16, 19 & 20) I have completed compiling the results of 7 tests, for which one of these tests the variances are unequal. I wish to perform an ANOVA between the three groups but for the one test with unequal variance (<0.001 by both bartlett and levene's test) I am not sure what to do. I thought i would run

Hi, I''m doing VGA passthrough for an ATI (HD 6770) graphics card to a DomU Windows. The passthrough itself is working. However, everytime when I reboot the DomU Windows, the whole machine freezes. I see no error messages from Dom0 kernel or the xen qemu log (or perhaps I haven''t got the most verbose debugging turned on?). Though from what I can tell, the the freeze happens

The reason being a design decision of a while ago that "T" and "F" shouldn't be reserved words in R as they are in S-plus. Hence, T & F are just variables being set to TRUE and FALSE respectively; they *can* be overwritten by the user which is very useful e.g., when you do mydat <- read.table(file, header =TRUE) and the file has variable names "T" or

I've installed Samba 3.0.2 (from the source) on a SuSE 8.2 system with MIT Kerberos 1.3.1 (I uninstalled the Heimdal code) and the OpenLDAP 2.1.27 development libraries installed on it. I want to make this system a domain member of a Win2K native-mode ADS domain but can't get "net ads join" to work. I've run "kinit myid@MYDOMAIN.COM" and I get at ticket, but when

I am having difficulty extracting specific results from the model object. The following code shows where I am stuck. I want to run resamplings of a data set. For each I want to extract a particular F for the contrasts. If I run a very simple model (e.g. model1 <- aov(time~group) ) I can get the relevant coefficients, for example, by using "model1$coefficients". That's fine.

Hello, I read a book about statistics in psychology. The authors use SPSS. They talk about post hoc tests after ANOVA finds significant effects: - Gabriel's procedure (for equal or slightly different sample sizes) - Hochberg's GT2 (for different sample sizes) - Games-Howell procedure (for populations with unequal variances) I could not find them in R. Do they not exist in R