Re: [ECOLOG-L] Analyzing a Large Correlation Matrix

2010-06-14 Thread Bob Ohara
Um, panic? :-) Start with summary statistics: simply calculate means, and plot histograms for every species. I'd guess you'll find quite a few are only in 1 or 2 plots, so they're not much use. That could reduce the number of species considerably. You'll also be able to spot the species with ou

[ECOLOG-L] Analyzing a Large Correlation Matrix

2010-06-13 Thread Jane Shevtsov
Dear list members, Stats books (and common sense) typically insist that you need to examine scatter plots of your data before computing a correlation coefficient. However, I have a species-plot matrix with 150 species, for which I plan to generate a correlation matrix as a start for further analys