search for: argyropoulos

...The funny thing is that Google's Safe Browsing Diagnostic page (it gives diagnostics about any page that it may contain Malware) does not seem to be working at the moment, so that the problems that it found with CRAN are not available for review. Anyone else has the same problems? Christos Argyropoulos University of Pittsburgh _________________________________________________________________ !

...differences between "&" and "&&" and how 'transform' works are accurate, both statements should produce the same output. I got the same behaviour in Windows XP Pro 32-bit (running R v 2.7) and Ubuntu Hardy (running the same version of R). Thanks Christos Argyropoulos University of Pittsburgh Medical Center _________________________________________________________________ Discover the new Windows Vista E

...ur. For example something like the following: "df degrees of freedom; one can specify df rather than knots; bs() then chooses df-degree-1 knots at suitable quantiles of x (which will ignore missing values) if the intercept argument is TRUE and df-degree if intercept=FALSE." Christos Argyropoulos _________________________________________________________________ Hotmail: Trusted email with Microsoft?s powerful SPAM protection.

...=3" , fixing the parameters of all other smooth terms appearing in the model statement to the values estimated in the first step. Then I could compare the (m=2) v.s. (m=3) models with ANOVA as the 2 models are properly nested within each other. Any other ideas? Sincerely, Christos Argyropoulos University of Pittsburgh _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. [[alternative HTML version deleted]]

...analysis method and do not wish to spend a lot of time coming up and debugging your MCMC implementations in WinBUGS/JAGS/OpenBUGS this would be the way to go. If you are strictly after frequentist analyses then you can still run them with BayesX (look at the REML chapter in the manual). Christos Argyropoulos > Date: Mon, 3 May 2010 23:18:28 +0200 > From: dutangc@gmail.com > To: r-help@r-project.org > Subject: [R] extended Kalman filter for survival data > > Dear all, > > I'm looking for an implementation of the generalized extended Kalman filter > for survival data,...

...a) test the model in which the covariate and the frailty appear as main terms using the penalized likelihood (for gaussian/t frailties) b)augment model 1) by stratifying on the variable that appers in the frailty term ? Thanks in advance! I apologise for sending this as html earlier today. Chris Argyropoulos University of Pittsburgh Medical Center Background ------------- I am trying to fit a cox proportional hazards model tothe data from a two arm (treatment indicator is 0/1) multicenter trial, adjusting for the presence of covariates and testing for the presence of a center (and possibly a treatmen...

...note, the DE method is one (actually the default) of the numerical integration methods implemented by Mathematica's NIntegrate function. It would be nice if someone found the time to augment R's integration facilities with this (and possibly other) numerical integration methods. Christos Argyropoulos University of Pittsburgh Medical Center _________________________________________________________________ s. It's easy! aspx&mkt=en-us

...=="MASS") splom(~Cars93[,5:8]|Origin,data=Cars93,panel=function(x,y,...) { panel.splom(x,y,...) dum<-format(cor(x,y,use="complete",method="kendal"),dig=2) panel.text(30,40,bquote(tau == .(dum)),font=2) },pscales=0,col="gray" ) Any suggestions? Christos Argyropoulos _________________________________________________________________ s. It's easy! aspx&mkt=en-us

Dear R helpers I have some data and through some other software, it is understood that I can fit the Frechet Distribution to it. However, I need to fit the distribution using R code only. I have searched many R packages and one R helper has suggested some sites too, but unfortunately parameters couldn't be estimated. Using LMOM package, I know how to estimate the parameters of Generalized

Hello again R users, I have a devilishly hard problem, which should be very simple. I hope someone out there will have the answer to this on the tip of their tongue. Please consider the following toy example: x <- read.table(textConnection("y x1 x2 indv.1 bagels 4 6 indv.2 donuts 5 1 indv.3 donuts 1 10 indv.4 donuts 10 9 indv.5 bagels 0 2 indv.6 bagels 2 9 indv.7 bagels 8 5 indv.8

Hi all, I have a large dataset that has >10k entries. The dataset is stored in a dataframe with the headers: SubID Condition1 Condition2 Result1 Result2 There are multiple entries for a given SubID(Subject ID). Condition 1 has 3 levels and condition2 has 2 levels (therefore there are 6 possible combinations all together e.g. Cond1 Level1 x Cond2 Level 1 etc.) and i need to compute for 1. The

Hello, everyone, I have a question about integration of product of two densities. Here is the sample code; however the mean of first density is a function of another random variable, which is to be integrated. ## f=function(x) {dmvnorm(c(0.6, 0.8), mean=c(0.75, 0.75/x))*dnorm(x, mean=0.6, sd=0.15)} integrate(f, lower=-Inf, upper=Inf) ## error message Error in dmvnorm(c(0.6, 0.8), mean = c(0.75,

I can run one-sample t-test on an array, for example a matrix myData1, with the following apply(myData1, 2, t.test) Is there a similar fashion using apply() or something else to run 2-sample t-test with datasets from two groups, myData1 and myData2, without looping? TIA, Gang

Hi All, I've been fiddling around with various ways to estimate the popularity of R, SAS, SPSS, Stata, JMP, Minitab, Statistica, Systat, BMDP, S-PLUS, R-PLUS and Revolution R. It's not an easy task. You can see what I've come up with so far at http://r4stats.com/popularity . I'm sure people will have plenty of ideas on how to improve this, so please let me know what you think.

...airs in R (Luis N) 36. Re: Show number at each bar in barchart? (David Winsemius) 37. Memory issues using R withing Eclipse-StatET (Harsh) 38. Kernel density estimate plot for 3-dimensional data (Pascal Martin) 39. Re: Idiomatic looping over list name, value pairs in R (Christos Argyropoulos) 40. Re: Idiomatic looping over list name, value pairs in R (Duncan Murdoch) 41. fit printed output onto a single page (Abiel X Reinhart) 42. Lazy evaluation in function call (Thorn) 43. Re: Kernel density estimate plot for 3-dimensional data (Duncan Murdoch) 44. strange behav...

Hello Everyone,   Learning about R and its wonderful array of functions. If it's not obvious, I usually try to find out what a function stands for. I think this helps me remember better.   One function that has me stumped is "sink." Can anyone tell me if this stands for something?   Thanks,   Paul         __________________________________________________ [[alternative HTML