Problem with having an item drawn repeatedly from a nested list

[liwenna]

Hi Joseph,

At first I thought your problem would be due to having a variable
'listaorlistb' in two consecutive lists... but I built a little
testexperiment based on your info and that doesn't seem to be a
problem... althoughI did not manage to replicate the last bit of info
you give, were you use the variable 'listaorlistb' as a nested list...
I could not figure that one out without having e-prime crash.

The good news is though, that there is a setup possible, close to what
you describe that does exactly what you need (or at least it does for
me, and I obviously don't know what other features your task has that
might interfere). I found that there is no need to use a variable
'listaorlistb' at all, not in the first 2 level list (as long as you
nest listA and listB well, you could use a variable like that for
logging though) nor in the actual lista and listb. I hereby post a
link to a screenshot of the setup that works for me. I opened the
three lists so that you can see all the parameters and randomisation
values. I hope it will help you to locate the litle culprit in your
own experiment.

http://images.redial.net/setuplistaorlistb.bmp

Good luck!

liw

On May 1, 10:50 pm, Joseph Williams <josephjaywilli... at gmail.com>
wrote:
> Hi Everyone,
>
> I'm having a problem with an item being drawn twice from a list that is
> nested in a non-typical way. I had to give two different groups of subjects
> two different sets of test items, so I had a list with counterbalance
> selection: the list had list A and list B nested inside along with a
> variable [listAorlistB]. The first level had list A as a nested list and the
> variable [listAorlistB] had value "listA", the second had the same for list
> B.
>
> Then a list containing the sub-procedure that displayed the (e.g. 5) test
> items had the variable ( [listAorlistB] ) as a nested list so that it always
> choose the relevant set of items. When I look at the data file (and examine
> the items by running the program) the first 4 items appear to be drawn
> randomly, but the 5th and last one is a repetition of one of the previous 4:
> e.g. 4 2 1 2 (instead of drawing item 3). The item numbers which are shown
> (like in the example) are correctly given by (e.g.) listA[logLevel5], but I
> don't understand why one is being repeated instead of drawing another one. I
> looked at multiple subjects and I always get this problem, and I noted is
> that the final and repeated item is always the item number in
> listA[SubTrial].
>
> Does anyone have any ideas about what the problem might be?
>
> Thank you,
>
> Joseph
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