Displaying 20 results from an estimated 1100 matches similar to: "Kruskal-Wallis, Friedman tests and Tukey HSD"
2001 Dec 05
3
Histograms per coding variable
Dear all
I have a dataset that looks like:
fr.wt site
1 4400 glen
2 235 glen
3 225 glen
' ' '
' ' '
' ' '
82 550 glen
83 550 kom
84 550 kom
' ' '
' ' '
' ' '
191 820 kom
192 2000 soet
' ' '
' ' '
I need to do a series of histograms for each of the codes, levels or
factors in
2002 Sep 25
2
Re-ordering the order of lattice graphics panels
Dear all
I have made some lattice graphs (bwplot(dead ~ treat | group,...).
'group' is a factor with three levels (Artemia larvae, Abalone larvae
and Abalone spat), and the result is a graph with three panels
corresponding to the levels in 'group', ordered in alphabetical order
from bottom to top, as expected.
How does one re-order the order in which the levels of
2006 Mar 04
1
Npmc for doing post-hoc after Kruskal
I followed the threads that enquired about doing post-hoc tests after doing
Kruskal testing. It took me to npmc. But npmc is giving an output I do not
understand.
I noticed a thread entitled "npmc function: 'x' must be atomic" but there
never appeared to be a resolution.
> npmc(npmcinput)
Error in sort(unique.default(x), na.last = TRUE) :
'x' must be atomic
2012 Jan 12
2
kruskal wallis post hoc?
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 correction for the pairwise comparisons)
Thank you
Dr. Iasonas
2006 Apr 27
1
Looking for an unequal variances equivalent of the Kruskal Wallis nonparametric one way ANOVA
Well fellow R users, I throw myself on your mercy. Help me, the unworthy,
satisfy my employer, the ungrateful. My feeble ramblings follow...
I've searched R-Help, the R Website and done a GOOGLE without success for a
one way ANOVA procedure to analyse data that are both non-normal in nature
and which exhibit unequal variances and unequal sample sizes across the 4
treatment levels. My
2002 Jul 16
3
dose.p in MASS
Dear all
I need to obtain an estimate of the 50% lethal dose (LD50) from a
logistic regression model obtained by applying the glm procedure to
some binomial data. The model appears to fit the data very well. I
used dope.p from MASS to try and find LD50.
The following output appears:
> dose.p(iso.glm.logit, cf = c(1,3), p = 1:3/4)
Error in dose.p(iso.glm.logit, cf = c(1, 3), p = 1:3/4) :
2005 Mar 14
2
Question about Tukey HSD (stat package)
Dear all,
I would be glad if someone could tell me if Tukey HSD (function of stats
library) accept the NA values and could correct the unbalanced design
(different number of sample in each group)
Thanks for help
Alice Le Bars
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 Apr 15
1
Kruskal-Wallis
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 <- rep
2017 Dec 31
0
clustering levels using Tukey HSD in a one way anova
Dear all,
I am doing a one way between subjects anova in an unbalanced data set.
Suppose we have "a" levels of the one factor. I want to merge the not so
significantly different levels into the same cluster.
Can I do a Tukey Kramer HSD and then use the following algorithm:
For i in 2 : "a"
For j in 1 : i-1
if mean of level i is not significantly different
2003 Nov 21
2
kruskal wallis for manova?
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
2009 Sep 07
1
Equivalence of Mann-Whitney test and Kruskal-Wallis test with k=2
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$p.value
[1] 0.01587302
b$p.value
[1]
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
2011 Jul 13
1
Tukey HSD with repeated measure ANOVA
Hi,
I need to determinate HSD value from a matrix like that
Thesis Days A1
Cx 0 66.07
Cx 0 60.24
Cx 0 42.86
Tw 0 66.07
Tw 0 60.24
Tw 0 42.86
Aa 0 66.07
Aa 0 60.24
Aa 0 42.86
Qe 0 66.07
Qe 0 60.24
Qe 0 42.86
Cx 56 310.86
Cx 56 223.17
Cx 56 186.77
Tw 56 149.42
Tw 56 127.75
Tw 56 138.59
Aa 56 130.24
Aa 56 214.83
Aa 56 137.95
Qe 56 186.64
Qe 56 189.09
Qe 56 187.87
this is my script
2010 Oct 11
1
How to get Mean rank for Kruskal-Wallis Test
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
2012 Jun 11
1
Kruskal Wallis Post hoc
Hi, I have searched and found a response to a question similar to mine but
when I tried the code, R says it's not an actual function so I thought I'd
ask here.
http://r.789695.n4.nabble.com/file/n4633035/Cookies.csv Cookies.csv
I have attached the 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
2007 Aug 09
1
Tukey HSD
Hi,
I was wondering if you could help me:
The following are the first few lines of my data set:
subject group condition depvar
s1 c ver 114.87
s1 c feet 114.87
s1 c body 114.87
s2 c ver 73.54
s2 c feet 64.32
s2 c body 61.39
s3 a ver 114.87
s3 a feet 97.21
s3 a body 103.31 etc.
I entered the following ANOVA command:
>dat <- read.table("mydata.txt", header=T)
2006 Nov 12
0
doubt on Tukey HSD
dear all
effect of a, b and c on d, total 48 comparisons, got
one anova result in model1=aov(d~A*B*C). can we get
all the result in one command? or can we interpret the
whole comparisons from this result? how it work in
Tukey HSD?
jose
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2010 Dec 12
1
Tukey HSD not working
Drug US1 US2 Aptecha
Celebrex 235.54 269.99 121.02
Detrol LA 157.99 190.99 55.3
Flomax 166.00 190.99 93.45
Lipitor 174.99 200.99 137.7
Novaldex 108.6 129.99 22.48
Norvasc 186.66 203.99 161.93
Plavix 107.99 106.99 64.53
Prevacid 117.39 134.99 59.83
Prilosec 115.99 126.99 57.75
Zyrtec 181.1 200.99 58.79
US1=c(235.54,157.99,166,174.99,108.60,186.66,107.99,117.39,115.99,181.10)
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