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Re: st: Confidence Intervals of Predicted scores in CLARIFY - adding together

From   Maarten buis <>
Subject   Re: st: Confidence Intervals of Predicted scores in CLARIFY - adding together
Date   Fri, 3 Sep 2010 16:33:20 +0000 (GMT)

--- On Fri, 3/9/10, James Laurence wrote:
> I want to create a graph in excel using the top two
> categories combined: so 0.674 + 0.183 = this gives me a
> predicted score of 0.86
> Here's  my question. I also want to add CONFIDENCE
> INTERVALS to this value using the C.I.s provided by CLARIFY.
> Do I simply add the C.I.'s together for the top two
> categories as I did with the predicted scores? 
> e.g. the C.I.s for this predicted score would be min. 0.656
> + 0.169  and the max. would be 0.691 + 0.199?
> So, the C.I.s of my predicted score of 0.86 (minimum 
> 0.825) and (maximum 0.888)? 

No, that way you are ignoring the correlations in the sampling
distribution. I don't think -clarify- returns a full variance
covariance matrix (though I could be wrong). In that case
the easiest solution is probably to run your simulations again,
but this time explicitly sampling the parameters that interest

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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