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Subject:

Modification to Wager and Nichols (2003) for Ordered Designs

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Fri, 18 Nov 2011 02:16:45 +0000

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 ```Hi All, I've been spending a lot of time thinking about design recently, and wanted a way to generate and test designs that have different ordering requirements. For example a design that alternates ABABABABA, or a more elaborate relationship such as ABBAABBAABBA. So, I've made some small changes to Tor Wager and Thomas Nichols' GA scripts and added a couple functions that allow you to specify a "transition probability matrix" for your time series. For example, the "ABABABABA" design would be specified as such: (rows are current event, columns are future event) %A %B GA.expTM = [.00 1.0; %A   1.0 .00] %B GA.TMorder = 1; The "ABBAABBAABBA" design would be specified as such: %A %B GA.expTM = [.00 1.0; %(AA)   .00 1.0; %(AB) 1.0 .00; %(BA) 1.0 .00] %(BB) GA.TMorder = 2; Of course, the matrix cells can take on any value from 0 to 1 (not just 0 or 1). The counterbalancing (transition matrix) can also ignore null events if you so desire. The code is very much untested, but it is well commented. I wanted to make the code available to everyone in case it's useful or people had suggestions to improve it: https://sites.google.com/site/mattare2/TransitionMatrixGA.zip?attredirects=0 If there's already a better way to do this, please let me know. Thanks, Andrew Mattarella-Micke University of Chicago ```