@article{JSSv014i10, title={Bivariate Poisson and Diagonal Inflated Bivariate Poisson Regression Models in R}, volume={14}, url={https://www.jstatsoft.org/index.php/jss/article/view/v014i10}, doi={10.18637/jss.v014.i10}, abstract={In this paper we present an R package called bivpois for maximum likelihood estimation of the parameters of bivariate and diagonal inflated bivariate Poisson regression models. An Expectation-Maximization (EM) algorithm is implemented. Inflated models allow for modelling both over-dispersion (or under-dispersion) and negative correlation and thus they are appropriate for a wide range of applications. Extensions of the algorithms for several other models are also discussed. Detailed guidance and implementation on simulated and real data sets using bivpois package is provided.}, number={10}, journal={Journal of Statistical Software}, author={Karlis, Dimitris and Ntzoufras, Ioannis}, year={2005}, pages={1–36} }