Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Count data are non-negative integers representing whole amounts.

When such data are the dependent variable in a regression, Poisson or negative binomial regression may be appropriate methods. One common problem is "zero-inflation" (where the proportion of zero values is greater than predicted by a distributional function); there are various models for dealing with this.

Wikipedia https://en.wikipedia.org/wiki/Count_data has an article with further references.

history | excerpt history