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Dear Sir, I am comparing two samples using wilcox.test in R. Literature appears to describe mann whitney u test as the most appropriate test to use on my data. is the wilcox.test function equivalent to mann-whitney u? Is there a way to gain the U-value as apposed to the W-value in R? Thank you

Hello, what I want to do, is, to write every element of a variable into a separate text-file automatically: My Variable: > wull [1] "Hallo Leute, wie gehts denn euch seid ihr noch alle..." [2] "Is their anyone how can help me with..." [3] "mann, mann, mann... das nervt aber.." [4] "how are you littele strange tiger..." [5] ")()()(UJKJKJIJIJJOO9989////////////" [6] "bradortslow, eiwudoiude, kdkdkdk:::idjidji" I was trying to do things like that: &g...

Hello - does anyone know whether there are any packages for Mann-Kendall mutation tests in R available? The only one I could find online is this MK_mut_test: Mann-Kendall mutation test in Sibada/sibadaR: Sibada's accumulated R scripts for next probably use to avoid reinventing the wheel. (rdrr.io) <https://rdrr.io/github/Sibada/sibadaR/man/MK_mut_test.ht...

Hi, I do want to use the Mann-Whitney test which ranks my data and then uses those ranks rather than the actual data. Here is the R code i am using: group1<- c(1.34,1.47,1.48,1.49,1.62,1.67,1.7,1.7,1.7,1.73,1.81,1.84,1.9,1.96,2, 2,2.19,2.29,2.29,2.41,2.41,2.46,2.5,2.6,2.8,2.8,3.07,3.3) > group2<-...

....test = data.norm.zo #normalized data nrow <- nrow(data.norm.test) ncol <- ncol(data.norm.test) p.ttest = rep(NA, nrow) #parametric test -- t test p.wilcox = rep(NA, nrow) #non-parametric test -- Mann-Whitney test fold.mean <- rep(NA, nrow) mean.na <- rep(NA, nrow) mean.nb <- rep(NA, nrow) sig.peak.all = data.norm.test g_1 = sig_test[1] g_2 = sig_test[2] col_s1 = 1; col_s2 = 1; for(i in 1:group){ if(i < g_1)...

...values of Samples 1 - 5 are significantly higher than the mean value for C (control). At first, I carried out mean, SD and t-test (one-tail). Although SD error bars are large, two of the samples have mean values that are significantly higher than that of C. Second, I carried out median and Coxon-Mann-Whittney test because of my worry about the size of my data and the high variations in the replicates. I was surprised however, that median and Coxon-Mann-Whittney tests did not reveal statistical significant results. I will be happy if anyone could adivce me on the best way to analyse this datase...

Hi, I know that I can perform a Mann-Whitney U test with wilcox.test(x,y) But instead of an U-value I get a W-Value. Is it possible to change this?

Hi, I have a statistical question. To apply the Mann Whitney test to compare a pair of vectors, they must to have the same length ? Thanks, Rodrigo [[alternative HTML version deleted]]

Hi all, The Kruskal-Wallis test is a generalization of the two-sample Mann-Whitney test to *k* samples. That being the case, the Kruskal-Wallis test with *k*=2 should give an identical p-value to the Mann-Whitney test, should it not? x1<-c(1:5) x2<-c(6,8,9,11) a<-wilcox.test(x1,x2,paired=FALSE) b<-kruskal.test(list(x1,x2),paired=FALSE) a$p.value [1] 0.015873...

Hi, Could someone please tell me how to perform a Mann-Whitney U test on a dataset with 2 groups where one group has more data values than another? I have split up my 2 groups into 2 columns in my .txt file i'm using with R. Here is the code i have so far... group1 <- c(LeafArea2) group2 <- c(LeafArea1) wilcox.test(group1, group2) This c...

Hi there, I'm trying to apply the Mann Kendall test for trend analysis of a time series. I have downloaded and installed the package Kendall and subsequently loaded it into the software. My time series is a .txt file with 2 columns - column 1 is the year (1985 - 2009) and column 2 is the corresponding entry variable. According to the...

...of ranks assigned to the group b W2 <- sum.rank.b - (length(b)*(length(b)+1)) / 2 W2 U2 <- length(a)*length(b)/2-W2 U2 #end code And given the fact that: - in the note of R Wilcox.test is clearly stated: ? The literature is not unanimous about the definitions of the Wilcoxon rank sum and Mann-Whitney tests. The two most common definitions correspond to the sum of the ranks of the first sample with the minimum value subtracted or not. R subtracts [?.], giving a value which is larger by m(m+1)/2 for a first sample of size m? - as result of the same test performed with different stat pack...

Does anyone have a piece of code or know how I can use R to generate a table of critical values for the Mann-Whitney (aka Wilcoxon Rank Sum) test. Ideally, I'd like a table that contains the critical values for any two samples of size 3 through 30. I could use Monte Carlo simulation or the normal approximation when n1 and n2 are greater than, 10, but I figured someone may know how to calculate these...

..."Does anybody know what is relation between 'T' value calculated by 'wilcox_test' function (coin package) and more common 'W' value?" I found the question interesting and ran the commands in R and SPSS. The W reported by R did not seem to correspond to either Mann-Whitney U, Wilcoxon W or the Z which I have more commonly used. Correction for ties may have affected my results. Can anyone else explain what the reported W is and the relation to the reported T? regards bob

Hello, I'm having some issues grouping cases for some Mann-Whitney U tests I'm attempting to run. I'm willing to use wilcox.test if it'll work; I've also tried wilcox_test() from the "coin" package. Here's the deal: for each column (A through H), I would like to run the two-sample independent test, comparing Group 5 (CD8.14 th...

Hi, It is possible to login a W2000 workstation into a Samba PDC (version 2.2.6)? Can I use "logon drive" and "logon home" to mount automatically at login time for W2000? Thanks, in advance, Sincerely Peter Mann Tel. +49 0561/804-2465 University of Kassel Computer-Center Secr. +49 0561/804-2287 Moenchebergstrasse 11 Telefax +49 0561/804-2297 D-34109 Kassel / Fed.Rep. Germany E-Mail Mann@HRZ.UNI-Kassel.DE PGP Public Key: http://ww...

Dear r-helpers, I want to test groups of samples for significant differences. Question: Does Group1 differ significantly from group2. This is a question to be answered by mann-whitney-u-test. I know that I can use wilcox.test with 2 samples. My problem: How can r perform the test automatically if there are more than 2 groups in my data frame. Test group1 vs. 2, 1 vs. 3, 1 vs. 4, etc. This is my skript: Deckung <- read.table("Gesamtdeckung.csv", sep=&quot...

Hello, I am hoping someone could shed some light into the Wilcoxon Rank Sum Test for me? In looking through Stats references, the Mann-Whitney U-test and the Wilcoxon Rank Sum Test are statistically equivalent. When using the following dataset: m <- c(2.0863,2.1340,2.1008,1.9565,2.0413,NA,NA) f <- c(1.8938,1.9709,1.8613,2.0836,1.9485,2.0630,1.9143) and the wilcox.test command as below: wilcox.test(m,f, paired = FALSE,...

...om SWAT, and it worked the first time on RH7.3, after it failed on RH8 You folks are the best, we're struggling to stay afloat and M$ squeezes us for more. (RH is pushing me to Debian by the day!!!) There will be a lot more Samba in the farm soon. My deepest grattitude. Respectully, Austin Mann

Hello, can someone please help me with coding a function for a bootstrap WMW test (package boot, R under Windows, version 1.6.2)?