Exercicies from the book "A Beginner's Guide to R" of Zuur et al. 2009
Zuur, A. F., Ieno, E. N., & Meesters, E. H. (2009). A Beginner's Guide to R (p. 150). New York: Springer.
@book{zuur2009beginner,
title={A Beginner's Guide to R},
author={Zuur, Alain F and Ieno, Elena N and Meesters, Erik HWG and others},
year={2009},
publisher={Springer}
}