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 [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.