Clarify September 2010

clarify@lists.gking.harvard.edu

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Using confidence intervals of predicted scores to GRAPH results

by James Laurence

Hi there, I was wondering if you might be able to help me with a query. I am using the STATA program CLARIFY (Michael Tomz, Jason Wittenberg, and Gary King (2001). CLARIFY: Software for Interpreting and Presenting Statistical Results. Version 2.0 Cambridge, MA: Harvard University, June 1. http://gking.harvard.edu) I'm using it to get a set of predicted scores from an OLOGIT model I've been running. So, I run the model. Then... setx mean setx div 0.1 simqi ...this gives me a set of predicted scores for each category of my OLOGIT dependent variable: Quantity of Interest | Mean Std. Err. [95% Conf. Interval] ---------------------------+-------------------------------------------------- Pr(newsre~t=1) | .025927 .0027974 .0209661 .0317577 Pr(newsre~t=2) | .1168595 .0059575 .1055424 .128563 Pr(newsre~t=3) | .6739712 .0090134 .6563168 .6909184 Pr(newsre~t=4) | .1832423 .0074309 .1699783 .1987786 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)? Is this correct? Thanks in advance James -- Clarify mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=clarify

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Clarify September 2010