Earlier today the 33rd Chicago Marathon was held. I will organise my comments by pointing out three epic fails.
First, of course, was the Chicago weather. After two successive marathon in excessive heat --- the 2007 race I completed, poorly, with its thousands of runners forced to abandon when the race was cancelled due to excessive heat, and the 2008 version which...

Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).