Re: Percent Change Crosstabs

Posted by Ryan on May 29, 2013; 4:31pm
URL: http://spssx-discussion.165.s1.nabble.com/Percent-Change-Crosstabs-tp5720440p5720463.html

John,

 

You certainly can. I thought the OP was interested in statistical testing/confidence intervals. 

 

With that said, one can use the approach outlined by Bruce or myself to test if the absolute difference is significantly different from zero.  

 

However, if one is interested in a statistical test regarding percent change in risk, then I would argue that it would be more appropriate to test whether the relative risk (RR) is significantly different from 1.0. With the model parameterized correctly, one could directly obtain the RR confidence limits, which could be converted to % change in risk.

 

Best,

 

Ryan

On Wed, May 29, 2013 at 12:22 PM, John F Hall <[hidden email]> wrote:

Forgive a naive question, but with a 2 x 2 table why can’t you simply calculate epsilon (% diff) by hand?  This technique is called elaboration,  See: M Rosenberg,  The Logic of Survey Analysis (Basic Books, 1968)

 

 

John F Hall (Mr)

[Retired academic survey researcher]

 

Email:   [hidden email] 

Website: www.surveyresearch.weebly.com

SPSS start page:  www.surveyresearch.weebly.com/spss-without-tears.html

  

  

 

 

 

 

 

From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of DKUKEC
Sent: 29 May 2013 14:53
To: [hidden email]
Subject: Re: Percent Change Crosstabs

 

Thank you Ryan & Bruce, Very much appreciate your replies and suggested syntax. I am looking for the following computations... for example: % Difference in recidivism rate = Treatment Recidivism % - Control Recidivism %. % Change in the recidivism = Difference % / Control Recidivism %. *************************************************************************** 2X2 CROSSTAB EXAMPLE Recidivist Non-Recidivist Total Treatment 816 1133 1949 Control 936 1013 1949 Row % Row % Row % Treatment 41.9% 58.1% 100.0% Control 48.0% 52.0% 100.0% ****** Would like to compute %************************* Difference -6.1% % Change -12.7% ***************************************************** Sincerely, Damir

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