Complex (for me) randomization

[ccbaye]

I don't understand it: When the selection is sequential in the faces
list, e-prime keeps the info about the face already presented through
the block (he does't start again the selection from scratch because
then I would have the same face presented again and again through the
blocks). BUT when I use random, he doesn't! He then cheerfully
replaces already presented faces..the same result as random with
replacement. Would someone be so kind to put me in the picture?

Best,
Christophe.

On May 19, 12:01 pm, ccbaye <cblai... at gmail.com> wrote:
> Ok..I finally managed to have the prog selecting one face and holding
> it for the rest of the block trials. yeepee. The problem now is that
> for each new block, the prog select a face at random in the
> corresponding face list, including the face that has been presented in
> the preceding block..So I can't yet manage to have a randomized
> selection of faces without replacement through the different blocks of
> my task..I am trying harder, but if someone (david?) has an idea, he/
> she is very very welcome!
>
> Best,
> Christophe.
>
> On May 19, 8:32 am, ccbaye <cblai... at gmail.com> wrote:
>
>
>
> > Dear David,
>
> > Thank you for your effort. Now I can give you my solemn word that I
> > have been through all the exercices :). I had the idea to change the
> > weights in the male face and female faces lists, in hoping that the
> > chosen stim would be repeated the number of time I set the weight..but
> > it did not work either. I hope that it is easy and that I am just too
> > dumb to figure it out. I sent the problem also to the PST staff, but I
> > would need an answer quickly, and I was terrified at the idea to wait
> > up to 10 days to get an answer..So..please, as you think it is so
> > simple, I would be very grateful to you if you could provide me with a
> > hint.
>
> > Best,
> > Christophe.
>
> > On May 19, 12:49 am, David McFarlane <mcfar... at msu.edu> wrote:
>
> > > Christophe,
>
> > > Stock reminder:  1) I do not work for PST.  2) PST's trained staff
> > > takes any and all questions athttp://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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