Returns the na.action component recorded during estimation,
mimicking na.action behavior for fitted model objects.
# S3 method for pwmean
na.action(object, ...)The na.action object recorded by pwmean: an
integer vector of rows omitted because of missing outcome or domain values
(of class "omit" or "exclude"), or NULL if no rows were
omitted.
An object of class "pwmean" returned by pwmean.
Additional arguments (not used).