Dear all
I have a question concerning the inclusion of (auxiliary)
variables into the missing data procedure. I understand that a
rather "inclusive" strategy can increase efficiency and reduced
bias.
Now, I also have the feeling that the inclusion of a certain
(auxiliary) variable can have an additional cost that depends on
the degree of missingness of this (auxiliary) variable itself. If the latter is "too high",
couldn't this result in a higher disadvantage of including this
variable relative to the advantage (increase in efficiency and/or
reduced bias) that the inclusion of the variable could have? If
yes, does there exist a measure/rule of thumb to evaluate and
judge on this trade off?
Thank you for your efforts.
Philippe