randomizing blocks

[David McFarlane]

Chen,

I must be missing something, because I cannot see what's wrong 
here.  I imagine that you have a structure like

SessionProc
     BlockList
         BlockAProc
             BlockATrialList
         BlockBProc
             BlockBTrialLIst
         ...

(there are actually better ways to structure this (e.g., using a 
single BlockProc, and using an attribute to select the trial List), 
but this is how most beginners would do it).

In that case, if you set Order of BlockList to Random, and Order of 
each BlockXTrialList to Sequential, then E-Prime will present your 
blocks in random order, but trials within each block in sequential 
order (I have students practice this in my online course).

What am I missing?

-----
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 10/14/2013 10:00 AM Monday, Chen G wrote:
>I'm trying to design an experiment that consists of several blocks 
>of stimuli, such that the order of stimuli within each block is 
>fixed, but the order of the blocks is random. For some reason I 
>can't get it to work - when I run the experiment stimuli belonging 
>to different blocks are getting mixed.
>I used a main List object under the SessionProc with references to 
>the different blocks in the Nested column. Each block is itself a 
>List object which contains the relevant stimuli for that block. I 
>tried defining one procedure for all the blocks and I also tried 
>defining a separate procedure for each block. None seem to produce 
>the desired results.
>Any idea what I did wrong?
>
>Thanks,
>
>Chen

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