Re: st: Averages for missing values

[Richard Goldstein <richgold@ix.netcom.com>]

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.

Rich

SamL wrote:

> 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.
> Sam
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