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From |
Sue <likecats@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: -areg- question |

Date |
Thu, 17 Sep 2009 17:45:13 -0400 |

So those observations are not used to estimate the coefficient of variables that don't change within "mother_rc", but for all others, including the coefficients and variables that do vary at the "mother_rc" - level and that's why the number of observations doesn't change? On Thu, Sep 17, 2009 at 5:09 PM, Scott Merryman <scott.merryman@gmail.com> wrote: > On Thu, Sep 17, 2009 at 12:28 PM, Sue <likecats@gmail.com> 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 > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: -areg- question***From:*Scott Merryman <scott.merryman@gmail.com>

**References**:**st: -areg- question***From:*Sue <likecats@gmail.com>

**Re: st: -areg- question***From:*Scott Merryman <scott.merryman@gmail.com>

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