Re: [R] Calculating RMSE in R from hurdle regression object

2014-03-12 Thread Achim Zeileis
On Wed, 12 Mar 2014, Tim Marcella wrote: Hi, My data is characterized by many zeros (82%) and overdispersion. I have chosen to model with hurdle regression (pscl package) with a negative binomial distribution for the count data. In an effort to validate the model I would like to calculate the R

Re: [R] Calculating RMSE in R from hurdle regression object

2014-03-12 Thread David March Morla
Dear Tim, I think that in this paper you would find a suite of different metrics to evaluate your hurdle model: Potts, Joanne M., and Jane Elith. "Comparing species abundance models." Ecological Modelling 199.2 (2006): 153-163. Best regards, David March El 12/03/2014 18:55, Tim Marcella escr

[R] Calculating RMSE in R from hurdle regression object

2014-03-12 Thread Tim Marcella
Hi, My data is characterized by many zeros (82%) and overdispersion. I have chosen to model with hurdle regression (pscl package) with a negative binomial distribution for the count data. In an effort to validate the model I would like to calculate the RMSE of the predicted vs. the observed values