en.m.wikipedia.org
  
  
    

Poisson regression 139

In statistics, Poisson regression is a generalized linear model form of regression analysis used to model count data and contingency tables. Poisson regression assumes the response variable Y has a Poisson distribution, and assumes the logarithm of its expected value can be modeled by a linear combination of unknown parameters. A Poisson regression model is sometimes known as a log-linear model, especially when used to model contingency tables.
 Negative binomial regression is a popular generaliz...

  
  
    
    
  
  


Lambda should be exp(theta * x).