Exercise

Model selection

Make sure that moving from a linear model to a Mixed Effects Model is a useful and appropriate decision.

To directly compare the two types of models, you will need to fit the linear model using generalized least squares.

Note that the orchids data set and nlme library have been preloaded.

Instructions 1/3

XP

1
2
3

Fit a linear model of orchid abundance and humidity using Generalized Least Squares with gls().