Using and interpreting different contrasts in linear models in R

When building a regression model with categorical variables with more than two levels (ie “Cold”, “Freezing”, “Warm”) R is doing internally some transformation to be able to compute regression coefficient. What R is doing is that it is turning your categorical variables into a set of contrasts, this number of contrasts is the number of …

What roles should ecologist have in the society?

This post is a reflection on the roles that ecologist should have in the society, it was sparked by some discussion I had at the BES/SFE meeting in december. This is one of my first try at blogging essay-like away from my nice beloved R-code. First of I'd like to start with a definition of …