setting two different conditions for the experiment as a part of the initial script

[David McFarlane]

Kelsey,

What David V said, except that I would use Counterbalance by Subject 
selection instead of Offset by Subject.  Counterbalance does pretty 
much the same as Offset plus Reset/Exit After 1 Sample, but may be a 
bit more convenient.  Please see discussions at 
https://groups.google.com/d/topic/e-prime/JtLh6DxqCbs and 
https://groups.google.com/d/topic/e-prime/CHntiIUbUmc .


-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster)

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At 9/9/2014 05:19 AM Tuesday, Vinson, David wrote:
>Dear Kelsey,
>
>There's a really easy way to set this up using E-Prime: using Offset 
>by Subject selection to determine at the start of a run which 
>condition a Subject is in, selecting it from a higher level List.
>
>Create a List with two rows, one with procedure HighFrustProc and 
>the other LowFrustProc, weight = 1. This List can have the attribute 
>pctcorrect (.80 for low frustration, .30 for high 
>frustration).   Then set Selection properties of this List to Order: 
>Offset, Order by: Subject.   And Reset/Exit to Exit List: After 1 Sample.
>
>This way odd numbered subjects would run the HighFrust (or whatever 
>is in the first line of the List) and even numbered, the LowFrust.
>
>Then each of these two Procedures would contain the other various 
>elements of your experiment (e.g. the item Lists and trial 
>Procedures), using the same objects and sub-procedures wherever 
>possible to ensure that the two conditions are otherwise the same.
>
>If you don't like the strict alternation of odd/even Subject 
>numbers, could take the same kind of approach by creating a random 
>sequence in advance and using this to populate this List object (ie, 
>80 rows, again offset by subject number).  Not elegant but very easy 
>and transparent to implement.
>
>best,
>DavidV
>
>
>________________________________________
>From: e-prime at googlegroups.com [e-prime at googlegroups.com] on behalf 
>of Kelsey A Brown [kbrown6 at wellesley.edu]
>Sent: 08 September 2014 22:27
>To: e-prime at googlegroups.com
>Subject: setting two different conditions for the experiment as a 
>part of the initial script
>
>Hello Everyone,
>
>I am trying to use E-prime to build a stop signal frustration task, 
>but I have encountered a few complications in building the task.
>At the moment, I am trying to create an initial script that would 
>allow E-prime to automatically run a participant in a condition 
>(high frustration or low frustration) depending on the participant 
>number that I input before running the experiment.
>So for example, if I wanted to run 80 participants, half would be 
>placed in the high frustration condition and the other half would be 
>placed in the low frustration condition.
>
>I have some ideas about how this could theoretically be carried out, 
>but I'm not sure if/how this can actually be implemented in the 
>script. For example, I would want the initial script to begin by 
>telling the program to pull 40 random numbers 1-80 (I would need to 
>somehow make the same 40 numbers be pulled each time). The 40 
>numbers pulled would be placed in the low frustration condition 
>where pctcorrect (percent correct)=.80.
>If else, (so if one of the other 40 numbers were pulled), place the 
>participant in a high frustration condition where  pctcorrect 
>(percent correct)=.30.
>
>e.g. If I were running the program and I typed in my participant 
>number as 3 and 3 was one of the random numbers pulled between 1 and 
>80 then the program would automatically run the stop signal task 
>placing the participant in the low frustration condition where 
>pctcorrect=.80 (where participants could accurately inhibit on 80% 
>of stop signal trials).
>
>However, if the participant ID number was 8 and 8 was not one of the 
>40 random numbers initially pulled between 1 and 80 then the program 
>would place the participant in the high frustration condition where 
>pctcorrect=.30.
>
>
>Is this something that is possible in E-prime?
>
>I hope this makes sense. Thanks in advance for your input!
>-Kelsey

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