Displaying 20 results from an estimated 6000 matches similar to: "Using statistical test to distinguish two groups"
2006 Feb 27
4
Getting nuts with sortables...
Folks,
It has been a whole day spent on this but I still can''t get my mind
around the most probably very stupid/basic mistake here... First, the
code I use:
<h3>List A</h3>
<ul id="lista" >
<li id="item1"> Item 1</li>
<li id="item2"> Item 2</li>
<li id="item3"> Item 3</li>
</ul>
2013 Mar 15
2
phyper returning zero
Hi,
I am attempting to use phyper to test the significance of two overlapping lists. I keep getting a zero and wondered if that was determining non-significance of my overlap or a p-value too small to calculate?
overlap = 524
lista = 2784
totalpop = 54675
listb = 1296
phyper(overlap, lista, totalpop, listb,lower.tail = FALSE, log.p=F)
[1] 0
If I plug in some different values I get a p-value but
2012 Jul 22
2
R Beginner : Loop and adding row to dataframe
Hi everybody,
I am currently quite inexperienced with R.
I try to create a function that simply take a value in a dataframe, look for
this value in another dataframe and copy all the row that have this value
This example is a simplified version of what I am doing but it's enough to
help me
listA
Name NACE
a 1
b 2
c 3
ListB
NACE aaa bbb ccc
1 a a c
1 a a c
1 a a c
2 a a c
2 a a c
3 a a c
4 a
2005 Oct 11
2
Two factor (or more) non-parametric comparison of means
Can anyone suggest a good non-parametric test, and an R implementation of the test, that allows for two or more factors? Wilcoxon signed rank allows for only one.
Thanks,
John
John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
Baltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
University of Maryland School of Medicine
Division of
2017 Jun 23
2
Paired Weighted Wilcoxon test in R
Dear R-users,
I?m trying to perform a non-parametric statistical pairwise comparison of two samples "x" and "y" using the Wilcoxon test in R, but each of the pairs have a weight associated.
An example of my data is the following one:
set.seed(9)
x <- sample(x = c(1:100), size = 20, replace = TRUE)
y <- sample(x = c(1:100), size = 20, replace = TRUE)
weight <-
2002 Apr 17
4
union of lists
Hi there,
Given 2 lists of integer vectors, i.e.:
> lista1
$"1"
[1] 1 34 5
$"2"
[1] 2 1
$"3"
[1] 3 10 15
> lista2
$"1"
[1] 1 5
$"2"
[1] 2 1
$"3"
[1] 3 10 29
I want to obtain the union of both, defined
as the union of the vectors, that is
lista.union[[1]] <- union(lista1[[1]],lista2[[1]]):
> lista.union
2014 May 20
3
[LLVMdev] Use perf tool for more accurate time measuring on Linux
On 20 May 2014 17:55, Tobias Grosser <tobias at grosser.es> wrote:
> On 20/05/2014 18:20, Yi Kong wrote:
>>
>> On 20 May 2014 16:40, Tobias Grosser <tobias at grosser.es> wrote:
>>>
>>> On 20/05/2014 16:01, Yi Kong wrote:
>>>>
>>>>
>>>> I've set up a public LNT server to show the result of perf stat. There
2009 May 10
1
Function recommendation for this study...
Hi,
I'm not used to thinking along these lines, and wanted to ask your advice:
Suppose you have a sample of around 100, consisting of patients according to
doctors, in which patients and doctors are given a questionnaire with
categorical responses. Each patient somehow has roughly 3 doctors, or 3
rows of data. The goal is to assess by category of each question or DV the
agreement between
2006 Apr 16
0
Sortable
I have 3 sortables, namely lista, listb and listc. Lista being a static list
of items and will be drag n drop to listb and listc. Everytime I drag from
lista to either listb or listc, the items in lista will be removed. Is that
normal? If so, can anyone advice how can I maintain the items in lista so
that I can have duplicate items in listb and listc.
I am using rails for the development.
2017 Jun 24
0
Paired Weighted Wilcoxon test in R
Hi DC9,
As no one has answered, I would say that as both the survey package
and Professor Lumley are widely respected, that is as good as it gets.
Jim
On Fri, Jun 23, 2017 at 7:26 PM, Dreams Collector
<dreamscollector9 at gmail.com> wrote:
> Dear R-users,
>
> I?m trying to perform a non-parametric statistical pairwise comparison of two samples "x" and "y" using
2004 Sep 22
5
t test problem?
Hello,
I got two sets of data
x=(124738, 128233, 85901, 33806, ...)
y=(25292, 21877, 45498, 63973, ....)
When I did a t test, I got two tail p-value = 0.117, which is not significantly different.
If I changed x, y to log scale, and re-do the t test, I got two tail p-value = 0.042, which is significantly different.
Now I got confused which one is correct. Any help would be very appreciated.
2013 Feb 01
1
ks.test and wilcoxon.test results differ from other stat.packages
Probably, it's an obvious info, but I have not found anything in R FAQ
concerning
this feature/bug.
The results of ks.test and wilcoxon.test (in the Mann-Whitney version,
paired = 'FALSE') don't coincide with the results from the other statistical
packages, e.g. Statistica, Medcalc, and (as for MW test) from the numerous
online MW tests.
E.g.
Statistica p-value=0.0435353
Medcalc
2007 Feb 23
1
Repeated measures in Classification and Regresssion Trees
Dear R members,
I have been trying to find out whether one can use multivariate
regression trees (for example mvpart) to analyze repeated measures data.
As a non-parametric technique, CART is insensitive to most of the
assumptions of parametric regression, but repeated measures data raises
the issue of the independence of several data points measured on the
same subject, or from the same plot
2009 Sep 22
2
No parametric methods
Hello I am interested in finding out a method of power analysis (effect
size and sample size calculation ) using R in non parametric methods?
I am running R 2.8.1 running on linux open SUSE
Any libraries or documentation , I was not bale to google up any.
Thanks in Advance,
Ben-Ari Alon, MD
University of Pittsburgh.
[[alternative HTML version deleted]]
2002 Sep 06
1
acutally a statistics question
hi,
knowing there are a lot of statistics guru's in the R-mailing list, i
throw in a statistics question.
i have data that i do not know how to statistically test:
subjects are repeatedly asked to make a decision (e.g. left-right ->
coded as 0 or 1). i have 20 subjects, each subject made 8 decisions.
i now want to analyse whether my experimental manipulation induced a
systematic bias
2006 Sep 02
2
Cuzick's test for trend
Hi All:
I was looking for, but could not locate in the packages, or in the R archive searches if there exists an R implementation of Cuzick's test of trend. The test is described as follows:
An extension of the Wilcoxon rank-sum test is developed to handle the situation in which a variable is measured for individuals in three or more (ordered) groups and a non-parametric test for trend
2010 Nov 24
2
Wilcoxon Rank Sum in R with a multiple testing correction
Hi there,
I'm a total newbie to R. I'd like to use a Wilcoxon Rank Sum test to compare
two populations of values. Further, I'd like to do this simultaneously for
114 sets of values. The two populations are C and N. The different sets of
values have arbitrary names (I'll call them a, b, c etc). The set-up is as
follows:
a b c d ....
C 2
C 3
C 5
C 9
C 4
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
2008 Jan 23
6
Two-way non-parametric ANOVA?
We need a two-way non-parametric ANOVA in order to analysis properly some
ecological data, do you know any reference in R? or how to do it?
Thank you very much
All the best
diana
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2016 May 05
2
GSoC 2016 - Introduction
Hello,
Thanks James for the reply. That cleared a few things out. Apologies for
replying late because of exams going on.
I was going through the previous clustering API to understand how it worked
and it seems like the the approach for construction of the termlists which
are used for distance metrics use TF-IDF weighting with cosine similarity,
which is very similar to the approach I would need