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Re: st: confa with R2>1


From   Stas Kolenikov <skolenik@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: confa with R2>1
Date   Tue, 30 Aug 2011 16:14:01 -0500

-sem- will produce the same result, although it does work faster.
Sorado would want to specify -robust- option, and if the negative
variance of BORED variable retains significance, modify the model.

BTW, Stata convention is to have variables in lower case. I guess it
follows the Internet (and earlier email) formatting convention that
one uses capital letters when they need to SHOUT SOMETHING OUT LOUD.
The data set in question was probably exported from another source
such as SPSS.

On Tue, Aug 30, 2011 at 10:07 AM, Anders Alexandersson
<andersalex@gmail.com> wrote:
> It's a "Heywood case", so maybe you specified the wrong model.
> Heywood cases are discussed, for example, on pages 362-363 in the SJ
> 9(3) article for confa:
> http://www.stata-journal.com/article.html?article=st0169
>
> An alternative to the user-written -confa- is the new -sem- command in Stata 12.
>
> Anders Alexandersson
> andersalex@gmail.com
>
> Sorado  <Sorada.Tapsuwan@csiro.au> wrote:
>> I ran a confa model and found that one of my variables has an R2>1 (see variable called BORED). Did I specify something wrong?
>>
>> If anyone can help that would be greatly appreciated.
>>
>> Regards
>>
>> ****OUTPUT BELOW*******
>>
>> . confa (neg:  ANG ASH GUILT FEAR) (pos:  JOYFUL EXCITED HOPE) (amb:  IRRITATED BORED) (dep:  POWERL CONF DESPAIR), from(ones)
>>
> [...]
>> ------------------------------------------------------------------------------
>>             |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
>> -------------+----------------------------------------------------------------
> [...]
>> Var[error]   |
>>       BORED |  -.7293374   .1959337    -3.72   0.000     -1.11336   -.3453144
> [...]
>> -------------+----------------------------------------------------------------
>> R2           |
> [...]
>>       BORED |     1.5988
> [...]
>
> *
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> *   http://www.ats.ucla.edu/stat/stata/
>



-- 
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.

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