Displaying 20 results from an estimated 6000 matches similar to: "wilcox test on two data frames"
2007 Oct 22
3
median value dataframe coming from multiple dataframes
Hi all,
I am not a skillful R programmer and has I am handling with large dataframes (about 30000 x 300) I am in need of an efficient function.
I have 4 dataframes with the same dimension. I need to generate other dataframe with the some dimension than the others where in each position it has the median value of the 4 values in the same position coming from the 4 dataframes.
Grateful by your
2008 Mar 27
2
colMeans in a data.frame with numeric and character data
Hi all,
I would like to know if it is posible by, someway, to get colMeans from
a data.frame with numeric as well as character data, dispersed all over
the object. Note that I would like to get colMeans neglecting character
data.
I am really in need of some function proceeding in that way…
All the best
Diogo André Alagador
[[alternative HTML version deleted]]
2008 Nov 06
2
comparing matrices using max or min
Dear all,
I have 3 matrices with the same dimension, A,B,C and I would like to produce
a matrix D where in each position would retrieve the max(or min) value along
A,B,C taken from the same position.
I guess that apply functions should fit, but for matrices objects I am not
getting it.
thanks in advance,
Diogo André Alagador
[[alternative HTML version deleted]]
2009 May 16
3
How to save R "clean" sessions in BATCH mode?
Thanks a lot for all of you that have reply me about opening and
ending R workspaces in BATCH mode. However replies were a king general
and I?m afraid I could not take the entire message from them.
Therefore I chose to expose here a representative fraction of my work.
I have 50 Rdata files (F1,F2,F3,F4,
,F50) with objects inside.
I need to:
open F1:
- perform some simple operations
2007 Jul 20
3
R CMD SHLIB problem [make: *** No rule to make target ]
Hy all,
I apologize for my ingenuity in regard to interfaces in R, but I do need it for my work. In that respect I took a simple and small example from the net (the "hello world", one) to interface R with C.
I have a Windows XP OS using R.2.5.0 and in that regard I have installed the Perl and RTools files to my PC. I also wrote a proper path file, as suggested.
The C program is:
2008 Mar 02
1
an efficient pairwise matrix cell's comparison function
To all,
I am undergoing an analysis involving big matrices of about 30000x200 which
I have to handle in a more efficient way. So I would like some advice to
build such efficient function to deliver the following result:
- starting with 2 matrices of the same dimension (eg. A and B)
0 0 3 5 6 0 0 5
A= 0 0 6 4 B= 0 4 3 5
2007 Jul 20
1
Column-mean-values for targeted rows
Hi all,
I'm handling massive data.frames and matrices in R (30000 x 400).
In the 1st column, say, I have 0s and 1s indicating rows that matter; other columns have probability values.
One simple task I would like to do would be to get the column mean values for signaled rows (the ones with 1)
As a very fresh "programmer" I have build a simple function in R which should not be very
2008 Aug 21
1
[dist]how to analise a large matrix?
Hi all,
I have a matrix of about 100.000?x 4?that I need?to classify using
euclidean metric. For that I am using dist?or daisy functions, but I
am afraid that the message: Error in vector("double", length) : vector
size specified is too large, means too much lines.
Can anyone suggest me how should I analyse this matrix?
Thanks in advance,
Diogo Andr? Alagador
MNCN,CSIC, Madrid, Spain
2009 Apr 03
2
Basic doubts on the use of several script files in R batch mode
I already searched for information regarding the batch file operations
within R. But I could not locate the information I need.
Basically I have a doubt regarding the procedures on the batch use of
several script files (*.R).
How can I do this?
How can I define the order of files?
My intention is to programme openings, math operations and savings of
*.Rdata sessions, but in a sequential
2008 Oct 31
4
[ifelse] how to maintain a value from original matrix without probs?
Dear all,
I have a matrix with positive and negative values.
>From this I would like to produce 2 matrices:
1st - retaining positives and putting NA in other positions
2nd - retaining negatives and putting NA in other positions
and then apply rowMeans for both.
I am trying to use the function ifelse in the exemplified form:
ifelse(A>0,A,NA)
but by putting A as a 2nd parameter it
2006 Nov 08
2
interprete wilcox.test results
Dear All,
I am using wilcox.test to test two samples, data_a and data_b, earch sample has 3 replicates, suppose data_a and data_b are 20*3 matrix. Then I used the following to test the null hypothesis (they are from same distribution.):
wilcox.test(x=data_a, y=data_b, alternative="g")
I got pvalue = 1.90806170863311e-09.
When I switched data_a and data_b by doing the following:
2006 Sep 07
1
Running wilcox.test function on two lists
Dear all,
I'm a newbie to R and I would really apperciate any help with the following:
I have two lists, l1 and l2:
l1:
$"A*0101"
[1] 0.076 0.109 0.155 0.077 0.09 0 0 0.073
[9] 0.33 0.0034 0.0053
$"A*0247"
[1] 0 0 0.5 .004 0 0 0
$"A*0248"
[1] 0 0 0.3 0 0.06
....
l2:
$"A*1101"
[1] 0.17 0.24 0.097 0.075 0.067
$"A*0247"
numeric(0)
2023 Jan 29
2
[REGRESSION] GM20B probe fails after commit 2541626cfb79
On Fri, 27 Jan 2023 at 20:42, Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> wrote:
>
> On Fri, Jan 27, 2023 at 04:00:59PM +1000, Ben Skeggs wrote:
> > On Fri, 20 Jan 2023 at 21:37, Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> wrote:
> > >
> > > On Wed, Jan 18, 2023 at 11:28:49AM +1000, Ben Skeggs wrote:
> > > > On Mon, 16 Jan 2023 at 22:27, Diogo
2010 Aug 17
3
Weird differing results when using the Wilcoxon-test
Hi,
I became a little bit confused when working with the Wilcoxon test in R.
As far as I understood, there are mainly two versions:
1) wilcox.test{stats}, which is the default and an approximation, especially,
when ties are involved
2) wilcox_test{coin}, which does calculate the distribution _exactly_ even,
with ties.
I have the following scenario:
#---BeginCode---
# big example
size = 60
2011 Sep 28
1
Wilcox test and data collection
Dear Contributors
I have a problem with the collection of data from the results of a test.
I need to perform a comparative test over groups of data , recall the value
of the pvalue and create a table.
My problem is in the way to replicate the analysis over and over again over
subsets of data according to a condition.
I have this database, called y:
gg t1 t2 d
40 1 1
2009 Dec 18
1
Doubts about ADE-4
Hi,
I'm having some troubles in using the ADE-4 package. I want to analyze data
for the Outlying Mean Index in the function 'niche'. I've got two matrixes:
one for environmental data and the other for species abundance data. But to
implement the analysis, as I understand it, I need to put tocheger these two
matrixes in one, as in the example provided with the package. Un
2023 Jan 27
3
[REGRESSION] GM20B probe fails after commit 2541626cfb79
On Fri, 20 Jan 2023 at 21:37, Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> wrote:
>
> On Wed, Jan 18, 2023 at 11:28:49AM +1000, Ben Skeggs wrote:
> > On Mon, 16 Jan 2023 at 22:27, Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt> wrote:
> > > On Mon, Jan 16, 2023 at 07:45:05AM +1000, David Airlie wrote:
> > > > As a quick check can you try changing
> >
2009 Sep 15
2
wilcox.test p-value = 0
hi, folks,
how have you gone about reporting a p-value from a test when the
returned value from a test (in this case a rank-sum test) is
numerically equal to 0 according to the machine?
the next lowest value greater than zero that is distinct from zero on
the machine is likely algorithm-dependent (the algorithm of the test
itself), but without knowing the explicit steps of the algorithm
2006 Aug 25
1
exact Wilcoxon signed rank test with ties and the "no longer under development" exactRanksumTests package
Dear List,
after updating the exactRanksumTests package I receive a warning that
the package is not developed any further and that one should consider
the coin package.
I don't find the signed rank test in the coin package, only the Wilcoxon
Mann Whitney U-Test. I only found a signed rank test in the stats
package (wilcox.test) which is able to calculate the exact pvalues but
unfortunately
2011 Dec 12
0
Rsolnp package: warning messages
Dear,
I am using the solnp command (package Rsolnp) for a problem with
equality and inequality constraints.
I am not getting convergence for my problem but apart that I get 1
warning per iteration saying: ?In cbind(temp, funv) : number of rows
of result is not a multiple of vector length (arg 1)?.
I checked for equality and inequality functions and they seem fine to
me. Where this