> Despite much searching, I'm unable to locate free source code that I
> know exists. Tried Netlib, GAMS, Numerical Recipes, and a few other web
> resources. I'm looking specifically for routines to calculate Spearman
> rank correlation coefficient, Mann-Kendall trend test, and/or other
> related non-parametric rank stats. Found plenty of documentation of
> routines, and some source code, but not the right one. Here's the
> closest I've come:
>
> http://gams.nist.gov/serve.cgi/Class/L1c1b/
> G02BNF Computes Kendall and/or Spearman non-parametric rank
> correlation coefficients