Randomised sub-lists

[ben robinson]

to do this you will probably need to manually assign a value for the Random
Seed for each 6 participants you see.
the first 6 participants might be assigned a random seed of '1', the next
six '2', etc.  if you set it up properly your list of 360 stimuli will be
shuffled according to the random seed value.
you could then determine which subset of 60 items, drawn pseudorandomly from
the larger set of 360 items, to present to your subject based on Subject
Number.  divide the the subject number by 6, take the remainder which will
always be a value from 0-5, and based on that value present one of six
different subsets.
something like that.  sorry if it's not very clear...

On Wed, Apr 21, 2010 at 11:53 AM, Hester <hester.duffy at gmail.com> wrote:

> Hi All,
>
> I'm trying to set up a study in which participants rate the stimuli
> used in another experiment. I have 360 stimuli in all, but I only want
> each participant to rate 60 of them, and I want to do this in such a
> way that each of the stimuli gets used the same number of times.
> Obviously I could just create 6 lists of 60 items each and use
> different run files each time, but I'm wondering if there's a more
> efficient and elegant way of doing it.
>
> I've tried setting the list to reset after a cycle of 360 samples, and
> to exit after 60, but having run it three times, and then compared the
> lists of stimuli used, I'm getting duplicates, so it's clearly not
> doing what I want. Basically, I need it to give the first participant
> a random list of 60 taken from the full list of 360; the second
> participant should then get a random list of 60 taken from the
> remaining 300, the next a random list of 60 from the remaining 240,
> and so on, until the sixth participant has a randomly-ordered list
> consisting of the remaining 60 items. It would then reset, so that the
> seventh participant gets a random list of 60 from the original 360
> (but not necessarily the same 60 as participant 1).
>
> Does anyone know whether E-Prime can do this, and if so, how?
>
> Many thanks,
>
> H
>
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