Data files for spatial statistics analysis

Although these data could be found from the main plot data sets with a little light programming, the coordinates of the large and medium trees of the three principal species (Mb, Microberlinia bisulcata; Tb, Tetraberlinia bifoliolata; and Tk, T. korupensis) are given more simply here in six files, one for each species in each of the P- and NW-plots. Each file has the same format (ANSI text, tab-delimited), with coordinates (‘x’ and ‘y’, m), stem diameter (‘diam’, cm), the size class (‘dcl’; 1 = medium [10 – < 50 cm], 2 = large [≥ 50 cm]) and species code (as immediately above). This allows spatial analysis of each species individually, or for large and medium trees separately, as well as same-species large/medium bivariate analyses. However, to run (a) analyses on the large trees divided into two more size classes (see main paper text), the median must be first found, and then trees labelled ‘diam’ < or ≥ the median; or (b) different-species large/medium bivariate analyses, the medium trees of one species needs be recombined with large trees of either of the other two (six possible combinations).