similar to: 2x2 test: total confusion.

I have the following contingency table dat <- matrix(c(1,506,13714,878702),nr=2) And I want to test if their is an association between events A:{a,not(a)} and B:{b,not(b)} | b | not(b) | --------+-----+--------+ a | 1 | 13714 | --------+-----+--------+ not(a) | 506 | 878702 | --------+-----+--------+ I am worried that prop.test and chisq.test are not valid given the

Hi all, Does anyone know if an R function for the Mantel-Haenszel chi-square for a 2x2 table exists? I’ve also seen it called the randomization Q statistic. Note that I’m not looking for the Cochran-Mantel-Haenszel…I did see that out there as cmh.test. Thanks in advance, Jeff Internal Virus Database is out-of-date. Checked by AVG Free Edition. 11:27 AM [[alternative HTML version

Dear Listers: I have a categorical feature selection problem for random forest. Suppose I have a multiple-leveled category variable A, which has m=3 levels: red, green, and blue and the final target is binary classification. I want to evaluate its power in discrimination between 2 classes. We know rf splits multiple-leveled category variable by considering all combinations of its levels. So

Hello R-users, I would like to generate two-way contingency tables with zero in one cell. I tried to use the function r2dtable but I could not force one cell to have zero value. Any Idea? Best regards.. Mahmoud [[alternative HTML version deleted]]

Hi all, I'm working on microarray and currently analyzing the microrarray data using limmaGUI. Loop design has been applied in this experiment. This is a 2X2 factorial experiment where there are control and treatment at 2 different time points, week 6 and 9. The experimental design is almost the same as the limmaGUI work example: Weaver Data set. I would like to look at the effect of

R 2.12 windows 7 I am summary data that I would like to make into a 2x2 table representing counts positive vs. negative counts: 28/289 20/276 My table should look something like the following: group1 group2 Positive 28 20 Negative 289 276 How can a (1) create the 2x2 table (2) run a chi square test on the table? I have tried the following code, but I

Hello. I'm looking for a method to simulate n different 2x2 tables having all the same odds ratio. For example. I need 100 tables with odds ratio 1 100 tables with odds ratio 2 100 tables with odds ratio 3 and so on. All tables should have the same marginal frequencies. Thank you -- View this message in context:

Dear Colleagues, Could you recommend a package of combination of functions in R for analysis of 2x2 tables of various designs. Preferably it should include tests and confidence limits (both exact and approximate) for alternative designs, such as independent proportions (e.g. parallel group clinical trials) and correlated proportions (matched pairs and crossover studies). Many thanks MM

I'm using fisher.exact on a 4x2 table and it seems to work. Does anyone know exactly what is going on? I thought fisher.exact is only for 2x2 tables. Note: I can't use chi-squared because I have a couple of cells with 0 and < 5 observations. -- View this message in context: http://r.789695.n4.nabble.com/fisher-exact-for-2x2-table-tp3481979p3481979.html Sent from the R help

Does anyone know how I can generate a 2x2 table in a format where in each cell of the table, it contains a) count (frequency) b) total percentage c) row percentage d) column percentage. SAS can generate this format easily, is there a R package that can do this? Frequency | Percent | Row Pct | Col Pct | positive negative | Total --------------------------------|------- disease |

Hi, Found no measure of association or correlation for 2x2 contingency tables in fullrefman.pdf or google. Can someone point to a package that implements such calculations? Thanx. -- Alexandre Santos Aguiar - consultoria para pesquisa em sa??de - R Botucatu, 591 cj 81 tel 11-9320-2046 fax 11-5549-8760 www.spsconsultoria.com

Hi, I'm analyzing experimental results where two different events ("T1" and "T2") can occur or not during an experiment. I made my experiments with one factor ("Substrate") with two levels ("Sand" and "Clay"). I would like to know wether or not "Substrate" affects the occurrence probability of the two events. Moreover, for each

Hi all, I'm working with a large data set (on the order of 300X300) and trying to apply a function which compares the elements of all possible 2x2 submatrices. There are rc(r-1)(c-1) such submatrices, so obviously the naive method of looping through the rows and columns is computationally unfeasible for my data set: for(i in 1:(nrow(data)-1)) { for(j in (i+1):nrow(data)) { for (m

Hi I''m pleased to announce that wxruby2 preview 0.0.40 is now available as source and binary gems for four platforms from https://rubyforge.org/frs/?group_id=35 CHANGES - upgrade to 2.8.3 - added the AUI (Advanced User Interface) classes and a sample - fixed some serious bugs with using paint() / DCs on Windows - lots of other important bugfixes - updates to sample and docs - See

Hi Just tried out the most recent dev release (2.7.1) of WxWidgets. The first bit of good news is that 2.7.1 has lots of attractive new widgets, such as RichTextCtrl, pickers, and the AUI. This is an add-on that''s now been merged into the core, and provides sophisticated things like dockable toolbars, perspective layouts, semi-transparent dragging etc. They seem to have brushed up

The Wine development release 1.1.42 is now available. What's new in this release (see below for details): - Support for shared 32/64-bit setups. - Dwarf debug info support for better backtraces. - More standard actions supported in MSI. - Support for TIFF image format in WinCodecs. - A number of Direct3D improvements. - Shell fixes for better Internet Explorer support. - Various

Dear Sirs. It seems to me a never ending story. We run a box with a TYAN Thunder 2500 Dual SMP mainboard, 2GB ECC Tyan certified memory, AMI Enterprise 1600 RAID adapter and additional Intel 1000/Pro server type (64 bit) GBit LAN NIC. With FreeBSD 4.8 this was stable, but to achive this state was really hard! It is a story similar to that what happend when we changed towards FreeBSD