[R] Comparing kendall's tau values?

From: Ashton, Gail <ashtong_at_si.edu>
Date: Tue, 22 Apr 2008 19:32:24 -0400


I have 3 variables relating to the successful introductions of species to 95 different areas: introduction frequency; number of successes pre 1906; number of successes post 1906

The data are not normal, nor homo-skedatic, so I am using non-parametric statistics.

I have calculated Kendall's tau between both introduction & successes pre 1906 (tau=0.3903) and introduction & successes post 1906 (tau=0.3317)- pre + post values are independent.

Is it possible to test whether there is a significant difference between the tau values, ie one correlation is 'significantly' 'better'? Is there a way to calculate confidence intervals for tau?

Thanks,

Gail  

Dr. Gail Ashton

Post-Doctoral Fellow  

Marine Invasions Research Group

Smithsonian Environmental Research Centre    

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