search for: landposi

Dear R Help, I am having difficulty using Variogram within GLS to examine spatial structure of nested data. My data frame consists of ecological measurements of a forest, in which three landscape positions ("landposi") are compared. Each landscape position is replicated five times ("replicat"), and the environment is measured ("canopy", "litdepth", etc.) one hundred times at 50-cm intervals along a transect ("distanc"). Thus, there are 1,500 rows of data. The raw...