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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 16:39:02 -0400
--
I was wrong, because I didn't bother to look up the -clarify-
commands. You don't need to go back to -ologit-.
*******
simpqi, genpr(pr1 pr2 pr3 pr4) // save category probabilities
gen pr34 = pr3 + pr4
mean pr1 pr2 pr3 pr4 pr34
*******
Note that predictions at the mean are not necessarily typical of the
majority of predictions. See:
http://www.stata.com/statalist/archive/2010-07/msg01596.html
-Steve
On Fri, Sep 3, 2010 at 12:35 PM, Steve Samuels <[email protected]> wrote:
> --
>
> 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
>>
>> *
>> * 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/
>>
>
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
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