Pseudo R-squared measures for Poisson regression models with over- or underdispersion

  title={Pseudo R-squared measures for Poisson regression models with over- or underdispersion},
  author={Harald Heinzl and Martina Mittlboeck},
  journal={Computational Statistics & Data Analysis},
The Poisson regression model is frequently used to analyze count data. Pseudo R-squared measures for Poisson regression models have recently been proposed and bias adjustments recommended in the presence of small samples and/or a large number of covariates. In practice, however, data are often overor sometimes even underdispersed as compared to the standard Poisson model. The de5nition of Poisson R-squared measures can be applied in these situations as well, albeit with bias adjustments… CONTINUE READING


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