Randomizing Block lists without randomizing the trial list

[liwenna]

Hi Poppy,

I got to admit that your explanation of what you did so far was mostly
lost on me... I reckon I won't be the only reader experiencing this
problem.

In general: realize that e-prime can use information from one single
level of each list within a chain of nested list for each run of the
most lowest ranked procedure.

So ... the thing that you call block where the image appears (and
remains) on the display and the pp answers questions: is this (and it
sound as if this is the case) one run of a list that has the 8 likert
scaled questions and procedures in the top 8 rows and the procedures
showing the two different decision questions in the lower two levels?
If so -> keep that list sequential (!!), it determines the order of
the questions.

The determination of the image itself should happen in a different
list that is either higher or lower ranked. If (and this may well be
the case) the attribute that determines which image is being shown is
also in this questions list or even in a lower ranking (nested) list,
then move it to a higher ranking list. If the attribute that
determines which image is shown is located in a list that is lower
ranked (nested into the questionslist) then for each level of the
higher ranking list (the 10 questions) a new level will be drawn from
the lower ranking list (the images) and hence a new, randomly drawn
image will appear for each question.

It might well be that I am totally on the wrong track in comprehending
what you did so far.., consider posting a screen shot here (or mailing
for instance me your studio file).

best,

liw



On Oct 19, 4:07 pm, Poppy <scarlet.qu... at gmail.com> wrote:
> Ok, I'm sure there is a remarkably simple way of doing this; but I've
> been banging my head against the desk for the last 2 days trying to
> pull it off.
>
> Basically; I am running a repeated measures design whereby a
> participant is presented with an image and answers 8 sequential likert
> questions about that image (the image remaining on screen as each
> question is presented), and then finally makes 2 decisions about that
> image (One a Binary Ultimatum game question and 1 a binary Prisoners
> Dilemma question) (again with the image remaining on the screen above
> the choices). That part I have done and works perfectly.
>
> The problem comes where each participant needs to see a total of 16 of
> these images, essentially 16 blocks of the trial spoken about above,
> and the order these 16 blocks are presented needs to be random. I've
> tried nesting the images and questions within trials, and I've tried
> different proc's for each trial, but everytime I try to randomise the
> list it ends up mixing up the order of the images and questions.
>
> Is there anyway to randomise the blocks, but keeping the trials within
> the blocks sequential?
>
> Thanks!

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