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I am helping a student with some logistic regression analyses and we are getting some strange inconsistencies regarding a warning about factor levels being dropped when running predict.glm(, newdata = ournewdata) on the logistic regression model object. We have checked multiple times that the factor levels have been defined similarly on both data sets (one used to estimate model and the newdata) and that values occur for all factor levels in both data sets. When I run these commands on my version of R (3...

...p ) On Tue, Dec 5, 2017 at 12:17 PM, Cade, Brian <cadeb at usgs.gov> wrote: > I am helping a student with some logistic regression analyses and we are > getting some strange inconsistencies regarding a warning about factor > levels being dropped when running predict.glm(, newdata = ournewdata) on > the logistic regression model object. We have checked multiple times that > the factor levels have been defined similarly on both data sets (one used > to estimate model and the newdata) and that values occur for all factor > levels in both data sets. When I run these commands o...