nested lists (to combine conditions)

[David McFarlane]

Hmm, FWIW, offhand I cannot think of a better way, so as far as I am 
concerned you are going about this the right way.

But if I did want to automate this to handle an increasing number of 
variables, then I might resort to using inline code to build all the 
accessory Lists from scratch.  That is not a project for the faint of 
heart, but if you dare, set Load Method of any List to Script, then 
look at the full code generated by E-Studio for hints.  And note that 
when you add List names to Nested, you do not need to create the List 
-- you may say "No" to the "create it" prompt, E-Studio will just put 
a "?" in the Structure where that List would go, and will trust you 
to provide it somehow later.

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


At 9/20/2012 10:08 AM Thursday, you wrote:
>I have an experiment with a list of 1024 lines that define certain conditions.
>
>There is an extra variable (64 different values) which is not 
>exactly task-relevant and that I can't combine with all 1024 
>combinations of other things because it would blow up the experiment 
>to 10,000s of trials.
>
>So my idea was to combine all 8 crucial conditions (each of the 8 
>crucial conditions consists of 128 combinations of other stuff, thus 
>summing up to 8x128=1024 trials) with the 64 values of the extra variable.
>
>What I did is as follows: I created 8 nested lists which are 
>identical (apart from their name obviously) and consist the 64 
>values of that other variable. Thus all 64 values of that variable 
>are equally often assigned to one of the 8 crucial conditions (i.e. 
>twice each), but not equally often to all 1024 conditions.
>
>It is quite unhandy to have all those lists and I can imagine that 
>one might have even more variables he/she wants to control for an 
>extra variable. So my question is: Is there an easier way of doing this?
>
>Thanks for any help!
>Tobias

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