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From | Maarten buis <maartenbuis@yahoo.co.uk> |
To | statalist@hsphsun2.harvard.edu |
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 you. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/