Addendum: If I select Sample > Drop observations with missing values, I get the message "No observations would be left" which is not the case (i.e. deleting cases listwise would not result in an empty sample).I realize this may be a different issue.On Thu, Jan 19, 2017 at 10:10 PM, John Paravantis <paravantis@gmail.com> wrote:Trying to run a Poisson regression of count data vs a number of covariates, I found out that if a covariate has missing values gretl complains that missing values were encountered.Is it possible to instruct gretl to just ignore cases with missing values listwise?If not, this is super annoying. I may be missing something.Best from Greece,John A. ParavantisUniversity of Piraeus