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Re: st: Averages for missing values
for criticism of the use of a dummy variable as per your description,
see: Jones, MP (1996), "Indicator and stratification methods for missing
explanatory variables in multiple linear regression," _JASA_, 91: 222-230.
These methods are frowned upon? Which method in particular is the object
of the frown? I guess I am puzzled, because mean substitution comes in a
few flavors. There is substituting the mean and leaving it at that. I
assume this is widely understood as problematic. And then there is
substituting the mean and adding a dummy variable to the model that
indicates whether the mean has been substituted. Is there any problem
with this second approach?
Thanks a bunch.
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