randomizing blocks

[Chen G]

Thanks, David.
The structure I have is a bit different, it looks either like this:

SessionProc 
     BlockList 
BlockATrialList
BlockAProc 
BlockBTrialLIst  
BlockBProc 
  
or if I try using one BlockProc for both lists and specify it only at the 
BlockList level, then it looks like:

SessionProc 
     BlockList 
BlockATrialList
BlockBTrialLIst    
BlockBProc 

I don't seem to be able to "nest" a List object under BlockProc as in your 
outline.
Any suggestions?

Thanks,
Chen


On Monday, October 14, 2013 9:42:52 PM UTC+3, McFarlane, David wrote:
>
> 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 ) 
>
> /---- 
> Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
> take any and all questions at https://support.pstnet.com , and they 
> strive to respond to all requests in 24-48 hours, so make full use of 
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> get an answer from PST staff, please extend the courtesy of posting 
> their reply back here for the sake of others. 
> \---- 
>
>
> 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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