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Re: st: Confidence Intervals of Predicted scores in CLARIFY - adding together
From
Steve Samuels <[email protected]>
To
[email protected]
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
[email protected]
On Fri, Sep 3, 2010 at 11:47 AM, James Laurence
<[email protected]> 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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