Negative Binomial

Poisson regression : Statistical models for counts and rates

What is a count ? Count is a number which is discrete and non-negative. Discrete means a number which is a countable and distinct. For example, number of road accidents. Road accidents can be 2 or 852 but can not be 2.1 or 85.5. So its discrete i.e integer. This is different to numeric continuous variable (such as blood pressure 120.2,135.9) which modelled differently. Count may also have contextual information i. »