Displaying 20 results from an estimated 2000 matches similar to: "Sum of sd between matrix cols vs spearman correlation between them"
2011 Dec 11
3
Bioconductor. MA plot for qPCR array
Dear all,
Is there anyway too generate MA plot for 2 qPCR assays (an array of 2x 400).
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2011 Dec 27
2
How to create a matrix with 3 dimensions from several 2 dimensional matrice?
Hi every one,
How is it possible to create a matrix with 3 dimensions from several 2
dimensional matrice?
Is it possible that each of "elementary/building block" matrices could be
called by its corresponding original name?
Thanks alot.
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2012 Mar 31
2
A introductory question about Zips law (Newbie to statistics)
Hi everyone.
Newbie to statistics.
I have 40 matrices of ~400 values. how may I determine whether the
distribution follows zips law?
response <-sample (1:20,400*4, replace= TRUE)
Thank you vry much.
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2012 Mar 14
2
Apply a loop containing a function on a list
Hi all,
I want to do this:
B.list$aa= (a loop containing My.fun acting on the reults of second
function on a A.list$aa))
or, overally
B.list$aa = function (A.list$aa)
B.list and A.list has many sublists aa, ab and.... Is there a way I can
apply the function and loop on all sublists of A.list and get B.list?
Thanks in advance.
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2011 Oct 22
1
How to it a "loess curve" and obtain the equation in R?
Hi!
How can I fit a loess curve to an array (384 x 2).
How can I obtain the equation for thi fi?
Thanks in advance.
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2006 Dec 05
1
Spearman correlation ties and discrepancies
Hi. I am currently trying to run some Spearman correlations, and have
encountered two issues.
1) When using cor.test() with a variable that includes ties, I get the
"Cannot compute exact p-values with ties" error. I have read that this
function now uses an asymptotic formula that allows for ties, so do not
understand why I am getting this error. (I am running version 2.4.0.)
I
2004 Mar 15
1
spearman rank correlation problem
Hello R gurus,
I want to calculate the Spearman rho between two ranked lists. I am
getting results with cor.test that differ in comparison to my own
spearman function:
> my.spearman
function(l1, l2) {
if(length(l1) != length(l2)) stop("lists must have same length")
r1 <- rank(l1)
r2 <- rank(l2)
dsq <- sapply(r1-r2,function(x) x^2)
1 - ((6 * sum(dsq))
2012 Aug 29
3
Help on calculating spearman rank correlation for a data frame with conditions
Dear all,
Suppose my data frame is as follows:
id price distance
1 2 4
1 3 5
...
2 4 8
2 5 9
...
n 3 7
n 8 9
I would like to calculate the rank-order correlation between price and
distance for each id.
cor(price,distance,method = "spearman") calculate a correlation for all.
Then I tried to use
apply(data,list='id',cor(price , distance , method =
2004 Aug 30
1
Wrong result with cor(x, y, method="spearman", use="complete.obs") with NA's???
Hallo!
Is there an error in cor to calculate Spearman
correlation with cor if there are NA's? cor.test gives
the correct result. At least there is a difference.
Or am I doing something wrong???
Does anybody know something about this?
a<-c(2,4,3,NA)
b<-c(4,1,2,3)
cor(a, b, method="spearman", use="complete.obs")
# -0.9819805
cor.test(a, b,
2011 Jan 21
0
Possible bug in Spearman correlation with use="pairwise.complete.obs"
Hi,
I have just encountered a strange behaviour from 'cor' with regards to
the treatment of NAs when calculating Spearman correlations. I guess it
is a subtle bug.
If I understand the help page correctly, the two modes 'complete.obs'
and 'pairwise.complete.obs' specify how to deal with correlation
coefficients when calculating a correlation _matrix_. When calculating
2002 Apr 26
2
Spearman Correlation
Hi all,
Is there a convenient way to calculate Spearman correlation coefficients in
R?
Nick
Nianqing Xiao, Ph.D
NCI Center for Bioinformatics, NIH
SAIC/Advanced Systems Group
> 6116 EXECUTIVE BLVD 4026J
> MSC 8335
> BETHESDA MD 20852
Phone: 301-451-6357
Fax: 301-480-4222
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2005 Jan 25
1
spearman rank test correlation
Hallo,
does anybody know if there is an implementation of the Spearman rank
correlation in R that gives a correct (or at least 'safe') p-value in
the case of ties??
I have browsed the R-help archives but I found nothing.
Thanks a lot in advance for any help,
Antonino Casile
2013 Feb 28
1
PCA with spearman and kendall correlations
Hello,
I would like to do a PCA with dudi.pca or PCA, but also with the use of Spearman or Kendall correlations
Is it possible ?
Otherwise, how can I do, according to you ?
Thanking you in advance
Eric Bourgade
RTE
France
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2008 Feb 28
4
p-value in Spearman rank order
Dear R-helpers,
I would like to do a Spearman rank order test, and used the cor() function
with the method "spearman".
It gives me a number (correlation coefficient?) , but how can I get the
p-value?
Thank you for the help in advance!
Regards,
Anne-Katrin
--
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2010 Apr 24
1
Multiple Correlation coefficient (spearman, Kenall)
Hi,
I'm currently trying to find/define a relationship between one dependent and
several independant variables.
The problem is that i cannot use the normal multiple regression/correlation
in Spss because the data is not normal distributed.
i calculated the spearman roh and Kendalls tau Correlation and also some
partial correlations in R.
Now i wanna find out the the multiple correlation
2011 Nov 01
1
How to interpret Spearman Correlation
Hi,
I am not really familiar with Correlation foundations, although I read
a lot. So maybe if someone kindly help me to interpret the following
results.
I had the following R commands:
correlation <-cor( vector_CitationProximity , vector_Impact, method =
"spearman", use="na.or.complete")
cor_test<-cor.test(vector_CitationProximity, vector_Impact,
2007 Mar 15
1
Incorrect matrix of spearman correlations .... in 64-bit Linux ... (PR#9568)
Full_Name: Vladimir Obolonkin
Version: tested in 2.0 to 2.4.1
OS: linux, win, mac
Submission from: (NULL) (202.14.96.194)
{{ Subject shortened manually -- to pass anti-spam filters
Original-subject: Incorrect matrix of spearman correlations working \
large (24000 by 425 and 78 by 425 data frames) in 64-bit Linux machines;\
the same code gives correct results in 32-bits Win and
2004 May 20
1
Spearman probabilities and SuppDists
cor.test and SuppDists give me different P-values for the same
Spearman's rho. Which is correct, or am I doing something wrong?
> x <- c(44.4, 45.9, 41.9, 53.3, 44.7, 44.1, 50.7, 45.2, 60.1)
> y <- c( 2.6, 3.1, 2.5, 5.0, 3.6, 4.0, 5.2, 2.8, 3.8)
> cor.test(x,y,method="spearman")
Spearman's rank correlation rho
data: x and y
S = 48, p-value =
2009 Nov 30
1
cor.test(method = spearman, exact = TRUE) not exact (PR#14095)
Full_Name: David Simcha
Version: 2.10
OS: Windows XP Home
Submission from: (NULL) (173.3.208.5)
> a <- c(1:10)
> b <- c(1:10)
> cor.test(a, b, method = "spearman", alternative = "greater", exact = TRUE)
Spearman's rank correlation rho
data: a and b
S = 0, p-value < 2.2e-16
alternative hypothesis: true rho is greater than 0
sample estimates:
2004 Mar 03
1
cor(..., method="spearman") or cor(..., method="kendall") (PR#6641)
Dear R maintainers,
R is great. Now that I have that out of the way, I believe I have
encountered a bug, or at least an inconsistency, in how Spearman and
Kendall rank correlations are handled. Specifically, cor() and
cor.test() do not produce the same answer when the data contain NAs.
cor() treats the NAs as data, while cor.test() eliminates them. The
option
use="complete.obs" has