Hello everyone,

I have a question regarding the function rlm of the MASS package.

The function fits a linear model by robust regression and has the argument na.action. The user should have the option to specify the action to be taken if NAs are found. I explicitly run the function with na.exclude to return the fitted values with the same length as the input, but actually the NA values are just lost. Is na.action implemented in the rlm function because actually changing the parameter for na.action does not do anything?