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Re: st: quasi-complete separation


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: quasi-complete separation
Date   Sun, 28 Aug 2011 16:43:36 +0100

Sabrina, and indeed anybody else: Please do not send, or attempt to
send, attachments to Statalist.
See http://www.stata.com/support/faqs/res/statalist.html#toask where
this is explained, twice over.

Sabrina: -logit y x- will work with this dataset, but there is only a
weak relationship.

Nick

On Sun, Aug 28, 2011 at 4:24 PM, Sabrina Helmut <vitamint@hotmail.de> wrote:
> I am sorry, the scatter has not been send. Thus, an example for you:
>
> binary dependent variable y
> continuous variable x
>
> y   x
> 0   1
> 0   2
> 0   3
> 0   4
> 1   1
> 1   2
> 1   3
> 1   4
> 1   5
> 1   6
> 1   7
>
> Thus, values of the independent variable being higher than 4 are only captured by y=1.
> So, is this a problem of quasi-complete separation? Thank you very much.
>
>
> ----------------------------------------
>> From: vitamint@hotmail.de
>>
>> I provided a scatter for you. Am I right with the assumption that it shows the problem of quasi-complete separation? Thanks.

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