<div dir="ltr">Thank you so much. This was extraordinarily helpful. I'll let you know how it goes!<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Feb 7, 2014 at 11:35 AM, David McFarlane <span dir="ltr"><<a href="mailto:mcfarla9@msu.edu" target="_blank">mcfarla9@msu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Heather,<br>
<br>
For complex randomization designs, the easiest fix is just to create one or more suitable sequences outside of E-Prime (e.g., Excel), and then use any of those sequences in an E-Prime List set to run in Sequential order.<br>
<br>
If you really want E-Prime to do this "on the fly", then things get a lot trickier. You could start with the "No Repeats on Consecutive Trials" examples on the PST website (those use an inefficient and nondeterministic "bogosort" method, see <a href="http://en.wikipedia.org/wiki/Bogosort" target="_blank">http://en.wikipedia.org/wiki/<u></u>Bogosort</a> ). I have explored more efficient & deterministic methods for this sort of thing, but as I say it gets tricky to do it right, and I have never implemented these in E-Prime.<br>
<br>
For more discussion about these types of problems, please search this Google Group, and the PST Forum (<a href="http://www.pstnet.com/forum/" target="_blank">http://www.pstnet.com/forum/</a> ), with terms such as "random", "pseudorandom", "pseudo-random", "constrain", and "constraint".<br>
<br>
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David McFarlane<br>
E-Prime training online: <a href="http://psychology.msu.edu/Workshops_Courses/eprime.aspx" target="_blank">http://psychology.msu.edu/<u></u>Workshops_Courses/eprime.aspx</a><br>
Twitter: @EPrimeMaster (<a href="https://twitter.com/EPrimeMaster" target="_blank">https://twitter.com/<u></u>EPrimeMaster</a> )<br>
<br>
/----<br>
Stock reminder: 1) I do not work for PST. 2) PST's trained staff take any and all questions at <a href="https://support.pstnet.com" target="_blank">https://support.pstnet.com</a> , and they strive to respond to all requests in 24-48 hours, so make full use of it. 3) In addition, PST offers several instructional videos on their YouTube channel (<a href="http://www.youtube.com/user/PSTNET" target="_blank">http://www.youtube.com/user/<u></u>PSTNET</a> ). 4) If you do get an answer from PST staff, please extend the courtesy of posting their reply back here for the sake of others.<br>
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<br>
At 2/5/2014 10:30 AM Wednesday, Heather Green wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I am trying to program an Eprime experiment that presents a standard sound 80% of the time and a deviant sound 20% of the time. The presentation of the sounds has to be random but I want to insure that at least two standards occur before every deviant and that no deviants are presented consecutively. I know that it can be done because I have seen articles in which the authors report doing just that using Eprime only I haven't been able to figure it out. Any advice would be appreciated.<br>
<br>
Thanks!<br>
Heather<span class="HOEnZb"><font color="#888888"><br>
</font></span></blockquote><span class="HOEnZb"><font color="#888888">
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