Perhaps a stupid question but I could not find a reply anywhere.
My dataset has over 2000 rows.
In the model the number of observations is a little over a 1000.
I get the warning message (Rows with NAs have been excluded)
How do I know exactly which rows have been used by the model?
I tried complete.cases of my dataset but it does not match.
(I am asking because I have both linear and categorical predictors and to plot from the fitted() I would need to know which observation belong to which category)