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


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Confidence Intervals of Predicted scores in CLARIFY - adding together
Date   Fri, 3 Sep 2010 12:35:28 -0400

--

James: To compute the  CIs, combine the two upper categories before
running -ologit-.

Note that the names of the programs  are  "Stata" and "Clarify".
Neither is an acronym like "SAS" or "SPSS".

Steve

Steven J. Samuels
sjsamuels@gmail.com


On Fri, Sep 3, 2010 at 11:47 AM, James Laurence
<james.laurence@sjc.ox.ac.uk> wrote:
> 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
>
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