[R] cor.test observations limit
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Apr 1 21:45:16 CEST 2003
Yes. About 1290 for the Spearman test.
You need (n^3 - n) representable as an integer.
On Tue, 1 Apr 2003, Ming-Chung Li wrote:
> Is there a limit on the number of observations for using cor.test. For
> > library(ctest)
That's not needed, and has not been for about 3 years.
> > cor.test(rnorm(3000), rnorm(3000), method="spearman")
> Error in if (q > (n^3 - n)/6) pspearman(q - 1, n, lower.tail = FALSE) else
> pspearman(q, :
> missing value where logical needed
> In addition: Warning message:
> NAs introduced by coercion
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
More information about the R-help