On Thu, Sep 17, 2009 at 12:28 PM, Sue <[email protected]> wrote:
> The only difference between the two is that the second is a regression
> with additional fixed effects using the variable "mother_rc". I'm
> wondering why the number of observations is the same in both
> regressions, even though there are values of mother_rc(the group id)
> that have only one observation and should therefore be dropped and not
> used in the regression.
Singletons will change the estimated value of the constant.
Scott
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