search for: biogeograph

Dear friends, I am sudying the mvpart package, that implements Multivariate Regression Trees, aiming at applying it to a biogeographical dataset of tree speces in southern South America. My doubt is how to access plot identities after the tree is produced. For us it is rather important, but I could not find them with neither 'summary(fit)'[where fit is the object containing the mvpart(...) command] nor just 'fit&...

...fit (rank= 10 ). Offending variable(s): slr_mean Error in j:(j + params[i] - 1) : NA/NaN argument Now if I add the singularity criterion and make the value smaller than the default of 1E-7 to 1E-9 or 1E-12 which is the default in calibrate, it works. Why is that? Not being a statistician but a biogeographer using regression as a tool, I don't really understand what is happening here. Does changing the tol variable, change how I should interpret goodness-of-fit results or other evaluations of the models created? I've included a summary of the data below (in case it might be helpful) with a...

Hi, I have spatially autocorrelated data (with a binary response variable and continuous predictor variables). I believe I need to do an autologistic model, does anyone know a method for doing this in R? Many thanks C Bell