Re: VIF

[Alan Neustadtl]

On Tue, 30 May 2000 22:12:11 -0400 (EDT), Donald F. Burrill wrote:

>On 31 May 2000, Vmcw wrote:
>
>> >>It is 10. I hope, you are talking about Variance Inflation Factor. 
>> >>More than 10 indicates severe multicollinearity.
>
>> >And where does this magic number come from? :)
>
>

One place I have seen the magic number referenced is in Besley, Kuh,
and Welsh, _Regression Diagnostics_.  This is an excellent reference. 
Also, Belsley's _Conditioning Diagnostics_.

Best,
Alan



===
This list is open to everyone.  Occasionally, less thoughtful
people send inappropriate messages.  Please DO NOT COMPLAIN TO
THE POSTMASTER about these messages because the postmaster has no
way of controlling them, and excessive complaints will result in
termination of the list.

For information about this list, including information about the
problem of inappropriate messages and information about how to
unsubscribe, please see the web page at
http://jse.stat.ncsu.edu/
===

Re: Internet & Email sampling

[Alan Neustadtl]

I agree with Dennis Roberts sentiment that:

>
>what seems like a simple notion is very complicated
>

This issue is being actively discussed and analyzed by people in AAPOR,
the American Association of Public Opinion Researcher's.  You can check
their www site (http://www.aapor.org/main.html) as well as examine
their journal and the upcoming meetings.  I am willing to bet there
wiil be multiple presentations on this topic.

Best,
Alan





===
This list is open to everyone.  Occasionally, less thoughtful
people send inappropriate messages.  Please DO NOT COMPLAIN TO
THE POSTMASTER about these messages because the postmaster has no
way of controlling them, and excessive complaints will result in
termination of the list.

For information about this list, including information about the
problem of inappropriate messages and information about how to
unsubscribe, please see the web page at
http://jse.stat.ncsu.edu/
===