search for: walli

I set up a shared mailbox with dovecot and it basically works. However, before I can imap SELECT or STATUS the shared mailbox I have to first do an imap LIST, i.e, . list "" * If list is not done first, the imap select or status command on the shared mailbox results in a "NO" response with "mailbox doesn't exist" response text. I can provide more

Hi everyone, I am working on analyzing spectra which requires hundreds of kruskal wallis tests to be performed. Once significant results are found post tests are performed ect. My questions are: how do I perform all these kw tests and save just the pvalues in a table? Is there anyway to have R automatically perform post tests if a result of p<0.05 is found? Currently when I run...

Dear all, I run a kruskal wallis test and found significant results. Then, I conducted all pairwise comparisons and found no significant results. Could anyone please give me a hint as to why this happens or redirect me towards a specific web page where I can find more info? (I used alpha=5% and made no bonferroni or other correct...

...data I am using. I am trying to look at two things: how moisture content changes over time, and how it changes along the length of a log (bolt). My data is not normal and doesn't become normal after ArcSin or Log transformations. Because the 'Days' has 4 levels, I performed a Kruskal-Wallis (kruskal.test) and got significant results. Same for comparing 'Cookie'. Neither of these have only 2 levels so significance here doesn't really explain it in depth....but everything I'm finding for post hoc with a KW says Mann Whitney. But when I try this (wilcox.test) in R it...

Recently, I ran a series of Kruskal-Wallace tests [kruskal.test()] using by() to group by site Output is a list: >Herb.KW Herb.df$ID: 10-1 Kruskal-Wallis rank sum test data: Indicator_Rating by Year Kruskal-Wallis chi-squared = 15.24, df = 7, p-value = 0.03302 ----------------------------------------------------------------------------------------------------- Herb.df$ID: 18-1 Kruskal-Wallis rank sum test data: Indicator_Rating by Ye...

Hello, Is there like the kruskal wallis test in relation to ANOVA (no restrictions on normallity and variance homogenity) something (in R) for MANOVA? thanks -- Dr.Nicolaas Busscher Universit?t GH Kassel Nordbahnhofstrasse: 1a, D-37213 Witzenhausen Phone: 0049-(0)5542-98-1715, Fax: 0049-(0)5542-98-1713

Hello, I need nemenyi-test or any other post-hoc test for kruskal-wallis, but I just can't find out how to implement this in R. My data set is nitrite concentrations in four different groups which I intend to compare. The kruskal-wallis-test showed significance, but I still don't know between which groups these significances are. Can anybody help me with this...

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...

Dear list! I work with multiple Kruskal-Wallis test (kruskalmc, package pgirmess), which evaluates differences in medians among groups (5 groups). A result of a test is significant differences among some groups, while median values are the same for 4 groups (using tapply). Why? p.s.: number of samples in groups vary from 50 to 4900. Thanks t...

Hi, Is anyone aware of a rank-based, non-paired test such as the Krustal-Wallis, that can accommodate weights? Alternatively, would it make sense to simulate a dataset by duplicating observations in proportion to their weight, and then using the Krustal-Wallis test? thanks! Dylan

Hello All, I want "Ranks' Table in R as like in SPSS ouput in the given link. http://www.statisticssolutions.com/methods-chapter/statistical-tests/kruskal-wallis-test/ Is the code is already available? Please let me know. Thanks, Lawrence

Hi, I have got two groups of samples; and for every row, I wish to calculate Kruskal-Wallis' p-value. In the example below, and the stars (****) show where I am struggling to design and put things together. Any help would be appreciated. myFile <- data.frame(Sample_1a = 1:10, Sample_1b = 2:11, Sample_1c = 3:12, Sample_2a=4:13, Sample_2b=7:16, row.names=LETTERS[1:10]) groups &lt...

Dear all Is there any way of doing a Tukey HSD post-hoc test after a Kruskal- Wallis or Friedman rank sum test (in the ctest package)? Thanks in advance, Albertus Dr. Albertus J. Smit Department of Botany University of Cape Town Private Bag Rondebosch 7700 South Africa Tel. +27 21 689 3032

Hi, I was wondering if it was possible to do the "Scheirer-Ray-Hare" extension of the Kruskal-Wallis test using R, or if it was possible to use some other non-parametric test for the following situation: I have continuous data that is grouped by 2 factor variables. I would like a non-parametric test because the group variances are not equal. I would like to look for the effects of either facto...

...istical analysis of a dataset. We aim to compare the sample means of more than 2 independent samples; the sample sizes are unbalanced. The requirements of normality distribution and variance homogeneity were not met even after transforming the data. Thus we applied a nonparametric test: the Kruskal-Wallis-test (H-Test). The null hypothesis was rejected. Now we try to find a suitable posthoc-test in order to find out which sample means actually are statistically different. 1. We think that the Behrens-Fisher-test and multiple steel test are not applicable, because they assume normality distributio...

...ive skew and platykurtosis and I was unable to obtain a sensible transformation to normalise them (obviously trying subtracting the value from range maximum plus one in this process). Hence, the usual Welch variance-weighted one way ANOVA needs to be replaced by a nonparametric alternative, Kruskal-Wallis being ruled out for obvious reasons. I have read that, if the treatment with the fewest sample numbers has the smallest variance (true here) the parametric tests are conservative and safe to use, but I would like to do this 'by the book'. TVMIA, Regards, Mike

I am seeing some rather strange behavior with synch of 2 directories on the same system using 2.6.2. The older file is the image of a full backup and is 29Gig in size. The new image is a slice of an incremental backup and is 101Meg in size. the command line is: time /home/wally/rsync/rsync-2.6.2 -av --rsh=rsh --backup --stats --block-size=<xxx> --write-batch=kbup1aaa

Hello, I think I am right in saying that a 2 sample wilcox.test is equal to a 2 sample kruskal.test and a 2 sample t.test is equal to a 2 sample anova. This is also stated in the ?kruskal.test man page: The Wilcoxon rank sum test (wilcox.test) as the special case for two samples; lm together with anova for performing one-way location analysis under normality assumptions; with Student's t

...Llevo poco tiempo con R y estoy atascado en un problemilla, a ver si podéis ayudarme. Estoy trabajando con una base de datos sobre personalidad en diferentes especies de aves. Esta base tiene datos de más de 7000 individuos y me gustaría crear un bucle mediante el cual realizar un test de Kruskal Wallis por cada especie (quiero ver si los comportamientos son consistentes dentro de cada especie). La base de datos que estoy (llamada birddata) utilizando sigue este modelo: Especie (factor) Audacia (numérico) Numero (factor) Cotorra...

1) L-moments: Does anyone know of any R code that will calculate these? (I'm aware that these can be calculated in S-Plus using the EnvironmentalStats for S-Plus module.) 2) Hosking & Wallis (1997): "Regional frequency analysis: an approach based on L-moments" Does anyone know of any code in either R or S-plus that implements the discordancy and homogeneity methods described in this book? Julian Wells OU Business School The Open University Walton Hall Milton Keynes MK7 6...