Complex (for me) randomization

[David McFarlane]

Christophe,

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
takes any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours (although latest 
reports indicate more like 10 days) -- this is pretty much their 
substitute for proper documentation, so make full use of it.  3) If 
you do get an answer from PST Web Support, please extend the courtesy 
of posting their reply back here for the sake of others.

That said, here is my take ...

This all seems rather simple to me, but perhaps I am missing 
something.  So before I expend any more effort, I need your solemn 
word that you have already worked completely through *all* of the 
exercises in *both* the Getting Started Guide and the User's Guide 
that came with E-Prime.  Or just wait a bit and some more 
understanding soul here may just jump in and answer you.

-- David McFarlane, Professional Faultfinder
"For a successful technology, reality must take precedence over 
public relations, for nature cannot be fooled."  (Richard Feynman, 
Nobel prize-winning physicist)


>Thank you for your help! I didn't figure out the problem by myself.
>
>I have a problem with a complex randomization. I would like my prog to
>pick out randomly without replacement a stim from a list of different
>male faces or different female faces at the block level, and than
>conserve this chosen stim all along the individual trials bound to
>this block. And so on for the successive blocks. Ultimately for each
>block, participants would have to rate a face (the chosen stim) on
>different scales (random presentation order without replacement);
>before pursuing to the next block: rating of another face with the
>same scales; etc.
>
>I used some nested lists,  But, until now, my prog selects another
>stim from the female or male faces list for each new trial. This is
>not what I want: I want that the stim chosen once at the block level,
>is used again and again for all the trials bound to this block. When
>this block of trials is over, the prog should start the second block
>and choose another face from the remaining stim of the face list, and
>this face should again be used again and again for all block trials,
>and so on. I can't attach the prog and the stims, but if someone was
>to help me, I could send it.
>
>Best,
>Christophe

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