For the last two cycles I’ve done some simple regression analysis of the informal vote. I saw Possum have his go at it, using a specification that is virtually the same as what I’ve run in the past (2007, 2004). The 2010 edition follows. As usual, electorate-level informality in House of Reps voting increases with



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