@article {WinSigKin95, title = {A Correction for an Underdispersed Event Count Probability Distribution}, journal = {Political Analysis}, year = {1995}, pages = {215{\textendash}228}, abstract = {We demonstrate that the expected value and variance commonly given for a well-known probability distribution are incorrect. We also provide corrected versions and report changes in a computer program to account for the known practical uses of this distribution.}, author = {Rainer Winkelmann and Signorino, Curtis and Gary King} }