Publications by Manos Parzakonis
Show me the mean(ing)…
Well testing a bunch of samples for the largest population mean isn’t that common yet a simple test is at hand. Under the obvious title “The rank sum maximum test for the largest K population means” the test relies on the calculation of the sum of ranks under the combined sample of size , where is the common size of the k’s samples. For ...
1185 sym R (702 sym/4 pcs) 16 img
Confidence we seek…
Estimating a proportion at first looks elementary. Hail to aymptotics, right? Well, initially it might seem efficient to iuse the fact that . In other words the classical confidence interval relies on the inversion of Wald’s test. A function to ease the computation is the following (not really needed!). waldci<- function(x,n,level){ phat<-sum(...
1253 sym R (1714 sym/4 pcs) 14 img
Probability of hypercubes…
…in R of course! There is a handy function to do those calculations. Normally (ahh!) you might resolve to a symbolic calculation package (Maple,Mathematica etc.) but that is not the situation any more. The calculations are done with the mnormt package. Relevant functions exist in other packages as well (R : Distributions) x <- seq(-2,4,lengt...
736 sym R (271 sym/1 pcs) 12 img
[S. Lynch] Introduction to Applied Bayesian Statistics and Estimation for Social Scientists
Well, that’s a good book that you shouldn’t miss “Introduction to Applied Bayesian Statistics and Estimation for Social Scientists”. Why you shouldn’t miss it? Coz, it’s practical and I mean p r a c t i c a l big time!!! I don’t own tons of (traditionally) printed books but that’s one of the few breaking the rule. I easily rank it...
900 sym 12 img
R twitts…
You may already know this… #rstats I think I might get an account when get to connect to the Internet in my mobile phone Related To leave a comment for the author, please follow the link and comment on their blog: Stats raving mad » R. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other to...
531 sym 14 img
Create factor variables in R
Instead of the factor() function which usually applies after defining a vector there’s the gl() base function to do this in one step, eg freq <- c(204,6,1,211,13,5,357,44,38,92,34,49) row <- gl(4,3,length=12) col <- gl(3,1,length=12) > col [1] 1 2 3 1 2 3 1 2 3 1 2 3 Levels: 1 2 3 tt <- data.frame(freq,row,col) > xtabs(tt) col row 1 2�...
549 sym R (267 sym/1 pcs) 12 img
R> if (done=TRUE) tweet me!
Let’s say that you’re fitting a cumbersome model so time is not to waste over a PC staring at the screen half anxious-half bored… Then, you can always leave and go on with meetings and all your daily routine and have R notify you the results! How? We will illustrate the situation above using some Bayesian Model Averaging code adapted by Mar...
1172 sym R (664 sym/2 pcs) 12 img
Start your engines; it’s a Linux era!
Well, I’m writing this from my new system. After years on hiatus I migrated to Linux, once again. Setting up a full system on Linux for a Greek user had been one of the greatest challenges. First,of all setting up writing, reading & printing in Greek was the biggest obstacle, I still recall memories of 2000/2001 when installing the 9th (?) edit...
1828 sym 14 img
[Event] R / Finance 2010: Applied Finance with R
One of the greatest event on R is under way… R / Finance 2010: Applied Finance with R April 16 & 17, Chicago, IL, US The second annual R / Finance conference for applied finance using R, the premier free software system for statistical computation and graphics, will be held this spring in Chicago, IL, USA on Friday April 16 and Saturday April 1...
2261 sym 12 img
lme4 stands 4 Linear mixed-effects…
There is a certain hype about mixed (and random) effects among statistician and analysts. You can show some love to Douglas Bates and Martin Maechler for maintaing the lme4 package for our cupid, R I copy the entity of the information of the projects page. Doxygen documentation of the underlying C functions is here. The project summary page you...
1278 sym 14 img