Discover how probability distribution methods can help predict stock market returns and improve investment decisions. Learn ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. David Kindness is a Certified Public ...

For binomial and Poisson distributions, the scale parameter has a value of 1. The variance of Y is for the binomial distribution and for the Poisson distribution. Overdispersion occurs when the ...

A two-part binomial-Poisson model, related to the bivariate Poisson distribution, is proposed to describe the changes in the counts of bird territories in successive years. The binomial part of the ...