https://en.wikipedia.org/wiki/Zero-inflated_model https://en.wikipedia.org/wiki/Zero-inflated_model or in Q&A format http://stats.stackexchange.com/questions/13

https://en.wikipedia.org/wiki/Zero-inflated_model https://en.wikipedia.org/wiki/Zero-inflated_model or in Q&A format http://stats.stackexchange.com/questions/13509/zero-inflated-models-true-zero-vs-excess-zero http://stats.stackexchange.com/questions/13509/zero-inflated...