Displaying 20 results from an estimated 500 matches similar to: "Nemenyi test as a post-hoc test to Kruskal Wallis"
2012 Jan 09
2
Unexpected results using the oneway_test in the coin package
Dear fellow R users,
Keywords: Kruskal-Wallis, Post-Hoc, pair-wise comparisons, Nemenyi-Damico-Wolfe-Dunn test, coin package, oneway_test
I am using the "oneway_test" function in the R package "coin" and I am obtaining results which I cannot believe are accurate. I do not wish to waste anyone's time and so if the following problem is rather trivial, I apologize, however I
2012 Mar 26
0
Different result with "kruskal.test" and post-hoc analysis with Nemenyi-Damico-Wolfe-Dunn test implemented in the help page for oneway_test in the coin package that uses multcomp
Dear Researchers,
Sorry for this email but I am not a statistician, and for this I have this
problem to understand. Thanks in Advance for help and suggestions.
Gianni
I have 21 classes (00, 01, 02, 04, ....,020) with different length. I did a
kruskal wall test in R with the following code
kruskal.test(m.class.l, m.class.length.lf)
Kruskal-Wallis rank sum test
data: m.class.l and
2005 May 02
2
Nonparametric Tukey-type multiple comparisons "Nemenyi" test
I am trying to do a Nonparametric Tukey-type multiple comparison
post-hoc test to determine which groups are significantly different. I
have read the dialogue on this topic from the R-help, and am still not
clear why no statistical packages include this test as an option? Is it
not an appropriate test to conduct on non-normally distributed data? Is
the only option to calculate it by hand
2008 Mar 06
1
kruskal wallis post hoc test in R
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?
Thanks
2007 Oct 26
1
Post-hoc test for Kruskal-Wallis
Hi there,
I've got a small question :
is there any post-hoc test for Kruskal rank sum test integrated in R ?
I know that the Nemenyi test is one of the post-hoc that can be used,
but there's no (to by knowledge) R function for it.
What should I do ?
Thanks,
Etienne
2008 Mar 10
2
question for aov and kruskal
Hi R users!
I have the following problem: how appropriate is my aov model under the violation of anova assumptions?
Example:
a<-c(1,1,1,1,1,1,1,1,1,1,2,2,2,3,3,3,3,3,3,3)
b<-c(101,1010,200,300,400, 202, 121, 234, 55,555,66,76,88,34,239, 30, 40, 50,50,60)
z<-data.frame(a, b)
fligner.test(z$b, factor(z$a))
aov(z$b~factor(z$a))->ll
TukeyHSD(ll)
Now from the aov i found that my model
2009 Mar 30
0
Kruskal-Wallis-test: Posthoc-test?
Hello.
We have some questions concerning the statistical 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
2009 Jun 19
2
Post-Hoc Test for Kruskal-Wallis Rank Sum Test
Hi list,
I would like to know if there is a way in R to execute a post-hoc test
(factor levels comparison, like Tukey for ANOVA) of a non-parametric
analysis of variance (kruskal.test() function object). I was looking for
something like the Dunn Test. I’ve searched the internet but nothing seemed
to define a way to it.
Do You have any suggestion? Other equivalent test maybe!
Thanks in
2006 Nov 07
0
Nemenyi test for two way layout data.
I am trying to do a Nonparametric Nemenyi test for multiple comparison in a two way layout data because I need to know the exact distribution. I don?t know if this test is in the R software. I just found a Nemenyi test for a one way design. But in Hollander book the Nemenyi test is in page 253 for to way layout data.
Thank you for your help.
2009 May 07
1
error using lapply with oneway_test (coin package)
Dear expeRts,
I would like to use a oneway_test (from package coin) to test whether
two groups differ on various variables. The variables are encoded
within a data frame. Unfortunately, I obtained an error, that I don't
understand. Could you please help me ?
Example:
library(coin)
y <- as.data.frame(matrix(rnorm(200), ncol=2))
group <- as.factor(unif(100))
lapply(y,
2009 Oct 14
3
post-hoc test with kruskal.test()
Dear R users,
I would like to know if there is a way in R to execute a post-hoc test
(factor levels comparison, like Tukey for ANOVA) of a non-parametric
analysis of variance with kruskal.test() function. I am comparing three
different groups. The preliminary analysis using the kruskal-wallis-test
show significance, but I still don''t know the relationship and the
significance level
2010 Apr 22
2
Jonckheere-Terpstra test using coin package?
Is it possible to implement the Jonckheere-Terpstra test for ordered
alternatives using the coin package: Conditional Inference Procedures
in a Permutation Test Framework?
I found jonckheere.test{clinfun}, but it uses a normal approximation
when ties are present in the data. To make this concrete, I've
include
a small dataset. Thanks. --Dale
Hollander and Wolfe, 1999 Table 6.6, pg 205
2012 Jul 12
1
permutation test on paired samples
Hi,
I'm trying to run a permutation test on paired samples.
First I tried the package "exactRankTests":
require("exactRankTests")
x <- c(1.83,0.50,1.62,2.48,1.68,1.88,1.55,3.06,1.30)
y <- c(0.878,0.647,0.598,2.05,1.06,1.29,1.06,3.14,1.29)
wilcox.test(x,y,paired = TRUE,alternative = "greater")
perm.test(y,x,paired = TRUE,exact = TRUE,alternative =
2007 Apr 10
1
When to use quasipoisson instead of poisson family
It seems that MASS suggest to judge on the basis of
sum(residuals(mode,type="pearson"))/df.residual(mode). My question: Is
there any rule of thumb of the cutpoiont value?
The paper "On the Use of Corrections for Overdispersion" suggests
overdispersion exists if the deviance is at least twice the number of
degrees of freedom.
Are there any further hints? Thanks.
--
Ronggui
2009 Apr 20
0
New versions for the distr-family of packages
-------------------------------------------------------------------------------
New versions released for the distr family of package
-------------------------------------------------------------------------------
We would like to announce the availability on CRAN (with possibly a
minor delay until on every mirror) of new versions of our packages
in the "distr"-family (version 2.1),
2009 Apr 20
0
New versions for the distr-family of packages
-------------------------------------------------------------------------------
New versions released for the distr family of package
-------------------------------------------------------------------------------
We would like to announce the availability on CRAN (with possibly a
minor delay until on every mirror) of new versions of our packages
in the "distr"-family (version 2.1),
2011 Nov 21
2
count ties after rank?
Hello!
I need to use Kruskal-Wallis test and post-hoc test (Dunn's test) for my data. But when I searched around, I only found this function: kruskal.test. But nothing for Dunn's test.
So I started to write one myself. But I do not know how to count ties in the data frame. I can use for loops but it seems long and unnecessary since the rank function actually knows the ties. So
2008 Oct 22
1
Saving kruskal wallis p-values
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 the
test
2013 Jul 02
0
Multiple Comparison Kruskal-Wallis Test on a dataframe
Hi
I have a dataframe of genomic positions something like below:
chr start end strand 1a 2a 3a 1b 2b 3b 1c
2c 3c 1d 2d 3d
chr1 201199522 201199523 - 51 62 63 46 53 58
53 78 37 27 65 62
chr1 201199584 201199585 - 42 49 35 54 62 55
43 56 26 21 64 63
chr1 201199603
2008 Feb 07
0
Kruskal-Wallis with binary data
Dear All,
I need to compare 4 groups of binary data having different sample sizes
and would like to know if the non parametric Kruskal-Wallis test
(kruskal.test) can be used for this purpose or not.
Many Thanks,
GK