rcorr Computes a matrix of Pearson's r or Spearman's
rho rank correlation coefficients for all possible pairs of
columns of a matrix. Missing values are deleted in pairs rather than
deleting all rows of x having any missing variables. Ranks are
computed using efficient algorithms (see reference 2), using midranks
for ties.
rcorr(x, y, type=c("pearson","spearman"))# S3 method for rcorr
print(x, ...)
rcorr returns a list with elements r, the
matrix of correlations, n the
matrix of number of observations used in analyzing each pair of variables,
P, the asymptotic P-values, and type.
Pairs with fewer than 2 non-missing values have the r values set to NA.
The diagonals of n are the number of non-NAs for the single variable
corresponding to that row and column.
a numeric matrix with at least 5 rows and at least 2 columns (if
y is absent). For print, x is an object
produced by rcorr.
a numeric vector or matrix which will be concatenated to x. If
y is omitted for rcorr, x must be a matrix.
specifies the type of correlations to compute. Spearman correlations are the Pearson linear correlations computed on the ranks of non-missing elements, using midranks for ties.
argument for method compatiblity.
Frank Harrell
Department of Biostatistics
Vanderbilt University
fh@fharrell.com
Uses midranks in case of ties, as described by Hollander and Wolfe.
P-values are approximated by using the t or F distributions.
Hollander M. and Wolfe D.A. (1973). Nonparametric Statistical Methods. New York: Wiley.
Press WH, Flannery BP, Teukolsky SA, Vetterling, WT (1988): Numerical Recipes in C. Cambridge: Cambridge University Press.
hoeffd, cor, combine.levels,
varclus, dotchart3, impute,
chisq.test, cut2.
x <- c(-2, -1, 0, 1, 2)
y <- c(4, 1, 0, 1, 4)
z <- c(1, 2, 3, 4, NA)
v <- c(1, 2, 3, 4, 5)
rcorr(cbind(x,y,z,v))
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