search for: 2x2

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 mailing list archive at Nabble.com.

...a frame TEST1 has four factor columns followed by thirteen numeric columns defined as : 1) Community, levels: "20232" 2) WT, levels: "B", "E", "M" 3) LTC, levels: "L", "M", "S", "1" 4) UC, levels: "1X1", "2X2" 5) UncDmd: Response variable in the linear model 6-16) M1...M11: Explanatory variables in the linear model A few sample rows in the data frame are as follows: > TEST1[1:15,] Community WT LTC UC UncDmd M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 1 20232 E L 1X1 1.000000 0 0 0 0 0...

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 fo...

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 in 1:(ncol(data)-1)) { for (n in (m+1):nco...

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 -...

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 ww...

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 HT...

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: http://r.789695.n4.nabble.com/Simulati...

I want to make a 2x2 plot on a single page, using stripplot() and boxplot(). I tried the following two alternatives with mfrow() and layout(), but none of them worked. library(lattice) par(mfrow=c(2,2)) boxplot(X1 ~ Y, data=tst1, horizontal=T, las=1) boxplot(X2 ~ Y, data=tst1, horizontal=T, las=1) stripplot(Y ~ X1, da...

...'rmetasim' library library(rmetasim) penguinland <- new.landscape.empty() penguinland <- new.intparam.land(penguinland,h=2,s=3) penguinland <- new.floatparam.land(penguinland,s=0) penguinland <- new.switchparam.land(penguinland,mp=0) ## local matrices are 3x3 (or greater than 2x2) matrixR <- matrix( c(rep(0.2, 3*3)), ncol=3,nrow=3,byrow=TRUE ) matrixS <- matrix( c(rep(0.1, 3*3)), ncol=3,nrow=3,byrow=TRUE ) matrixM <- matrix( c(1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0), ncol=3,nrow=3,byrow=TRUE ) penguinland <- new.local.demo(penguinland,matrixR,matrixS,matrix...

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 time, treatment and interaction. I have tried to follow the limmaGUI h...

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...

...ls. So suppose again I have 1000 such multiple-leveled category variables and I need to do some feature selection. Then I would like to try chi-sqr tests (or information gain). To match the splitting method used in rf, I am thinking if I should simply use mx2 contingency table or (2^(m-1)-1)'s 2x2 contingency tables in which I pick the best p-value to evaluate A's power. For the latter, I am sure it is very alike the way used in rf. But is the former good enough? Thanks. -- Weiwei Shi, Ph.D Research Scientist GeneGO, Inc. "Did you always know?" "No, I did not. But I bel...

...viation of the residuals cov1 <- matrix(c(3/4,-1/2,-1/2,-1/2,1,0,-1/2,0,1), nrow = 3, ncol=3, byrow=TRUE, dimnames = list(c("A", "B", "C"), c("C.1", "C.2", "C.3"))) # cov1 = variance covariance matrix of the beta coefficients of a # 2x2 factorial design (see Piantadosi 2005, p. 509) cm1 <- matrix(c(0, 1, 0, 0, 0, 1), nrow = 2, ncol=3, byrow=TRUE, dimnames = list(c("A", "B"), c("C.1", "C.2", "C.3"))) # cm1 = contrast matrix for main effects v1 <- csimint(estpar=c(100, 6, 5...

Hi everybody, I have a problem with the grid function in tk. I juste try to put 4 buttons like this: ------------------- | | | | | C | | A |--------| | | | ---------- D | | | | | B | | ------------------- A is 2x2 C is 1x2 B is 1x2 D is 2x2 but the code bellow dont work : require(tcltk) tt <- tktoplevel(borderwidth=10) A.but <- tkbutton(tt,text="A",command=function()ls()) B.but <- tkbutton(tt,text="B",command=function()ls()) C.but <- tkbutton(tt,text="C",comma...

Hi, I have created a list object like that : x = vector("list") for (i in 1:5) x[[i]] = rnorm(2) x Now I want to do two things : 1. for each i, I want to do following matrix calculation : t(x[[i]]) %*% x[[i]] i.e. for each i, I want to get a 2x2 matrix 2. Next I want to get x[[1]] + x[[2]] +.... I did following : res=vector("list"); res = sapply(x, function(i) t(x[[i]]) %*% x[[i]]) However above syntax is not giving desired result. Any suggestion please? -- View this message in context: http://www.nabble.com/A-question-on-ope...

...r 2 x 2 x {strata} frequency tables in vcd::oddsratio() to R x C x {strata} tables. For an R x C table, F, odds ratios can be defined in several ways; one simple way, particularly for tables with ordered factors, is to calculate the set of continuation odds ratios, based on the (R-1)x(C-1) set of 2x2 tables with elements F[i:(i+1), j:(j+1)] What I think I want is a method to extract all such 2x2 subtables to a structure (list?) so that I can use *apply or plyr methods to do the computations of (log) odds ratio (& std error) for each, and return these in a suitable form. Below, I defin...

...-series daughter board, you give up TWO of your physical ports. Is there a technical reason for the lack of such a card, or is it just a case of "insufficient business case" to justify the development? If it's the latter, I would like to state that I am ready to buy several '2x2' cards. I also assume I am not alone. I often run into situations where I am space constrained (embedded enclosure) or resource constrained (bus slots 1u rackmount) which rule out the obvious solution of a larger card (AEX/TDM2400P) and/or rule out the inclusion of an additional 4-port i...

II am translating some gauss code into R, and gauss has a matrix product function called the horizontal direct product (*~), which is some sort of variant on the Kronecker product. For example if x is 2x2 and y is 2x2 the horizontal direct product, z, of x and y is defined (in the Gauss manual) as: row 1 = x11*y11 x11*y12 x12*y11 x12*y12 row 2 = x21*y21 x21*y22 x22*y21 x22*y22 Or in R code if: x <- matrix(seq(1,4,by=1),2,2, byrow=TRUE) y <- matrix(seq(5,8,by=1),2,2, byrow=TRUE) The resu...