Displaying 20 results from an estimated 7000 matches similar to: "weighted Spearman correlation coefficient"
2009 Oct 01
2
GAM question
Hello evyrone,
I would be grateful if you could help me in (I hope) simple problem.
I fit a gam model (from mgcv package) with several smooth functions .
I don't know how to extract values of just one smooth function. Can you
please help me in this?
Kind regards,
Daniel Rabczenko
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 May 16
2
about spearman and kendal correlation coefficient calculation in "cor"
Hi,
I have the following two measurements stored in mat:
> print(mat)
[,1] [,2]
[1,] -14.80976 -265.786
[2,] -14.92417 -54.724
[3,] -13.92087 -58.912
[4,] -9.11503 -115.580
[5,] -17.05970 -278.749
[6,] -25.23313 -219.513
[7,] -19.62465 -497.873
[8,] -13.92087 -659.486
[9,] -14.24629 -131.680
[10,] -20.81758 -604.961
[11,] -15.32194 -18.735
To calculate the ranking
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 =
2008 Sep 10
3
making spearman correlation cor() call fail with log(0) as input
Hi,
How can I make the cor(x, y, method="spearman") call to produce an
error when the input to it (x, y) produces an error? Here is a simple
example:
> a <- c(0, 1, 2)
> b <- c(100, 2, 4)
## error:
> log(a)
[1] -Inf 0.0000000 0.6931472
## error, as expected:
> cor(log(a), log(b), method="pearson")
[1] NaN
## not an error any more (not expected):
>
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,
2003 May 01
3
Test statistic for Spearman correlation
In the ouput below, what is the "S" statistic (S = 96) that is used for Spearman? I don't have easy access to the books cited on the help page. Other texts and web sources that I have found use t or z as a test for Spearman, perhaps inappropriately. Can anyone tell me how S is computed or refer to a web resource?
I see from the code for that:
q <- as.integer((n^3 - n) * (1
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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r-help mailing list -- Read
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
2009 Aug 16
2
bootstrapped correlation confint lower than -1 ?
Dear R users,
Does the results below make any sense? Can the the interval of the
correlation coefficient be between *-1.0185* and -0.8265 at 95%
confidence level?
Liviu
> library(boot)
> data(mtcars)
> with(mtcars, cor.test(mpg, wt, met="spearman"))
Spearman's rank correlation rho
data: mpg and wt
S = 10292, p-value = 1.488e-11
alternative hypothesis: true rho is not
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
2005 Jul 03
1
Pearson and Spearman correlation coeffcients matrix
Hi everyone,
I've been trying to find a function that outputs the Pearson and/or Spearman
correlation coefficients for several variables with the associated
statistics in one single table/matrix. For what I've been able to understand
the Stats package is only able to compute these coeficients/statistics only
in defined pairs. This becomes time consuming when we want to determine
these
2013 Feb 05
1
plot significant spearman correlation
Hello,
I calculate the correlation between two matrices cor(x,y, method="spearman")
and I am wondering if it possible to see only the significant correlations. I can do that for single OTUs with cor.test() command but I would like to have an output for whole matrix. Besides,I would like to plot the relative abundance of each OTU, against the number of significant pair-wise correlations
2013 Mar 15
1
Spearman rank correlation
Hi
If I get a p-value less than 0.05 does that mean there is a
significant relation between the 2 ranked lists? Sometimes I get a low
correlation such as 0.3 or even 0.2 and the p-value is so low , such
as 0.000001 , does that mean it is significant also? and would that be
interpreted as significant low positive correlation or significant
moderate positive correlation? Also,can R calculate the
2003 Jan 23
1
spearman rank correlation
hello help,
i''ve searched through the manual pages and the only reference i can find to spearman rank correlation is cor.test, which only seems to give the significance value of the correlation.
is there any way to get the actual value of rho?
david.
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2006 Feb 28
1
Spearman correlation confidence interval
R-help(ers),
Does anyone know of an R function available for calculating a confidence
interval for a Spearman correlation? If no such resource is available,
is using the confidence interval from a Pearson correlation a reasonable
proxy if the vectors come from normal distributions (i.e. likely
indistinguishable from the true confidence interval in error bars of an
autocorrelogram or correlation
2003 Nov 26
1
Spearman correlation and missing observations
Hi,
I am using R 1.8.1 on WinXP. I encounter a problem when trying to
compute a Spearman correlation under certain conditions (at least I
think there is a problem, but maybe this is the normal behavior).
> X<-array(0,c(20,2))
>
> X[,1]<-c(runif(10),rep(NA,10))
> X[,2]<-c(runif(10),rep(NA,10))
>
> Y<-X[1:10,]
>
>
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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