Semirandomization of pictures

[David McFarlane]

LYT,

This kind of question comes up time and time again, and has been 
discussed several times.  You might start by searching this Google 
Group, and the PST Forum (http://www.pstnet.com/forum/ ), with terms 
such as "random", "pseudorandom", "pseudo-random", "constrain", and 
"constraint".  You might also ask folks at PST Support.

You will find this general advice, and a bit more, at 
https://groups.google.com/d/topic/e-prime/VCXgOWjKtCg .

Regards,
-- David McFarlane


At 2/7/2014 10:10 AM Friday, LYT wrote:
>My apologies, this was entirely unclear. Let me try again:
>
>I will have three identical blocks be played one after the other. 
>Each block will contain two lists (Set A, Set B) with 20 pictures 
>per Set. Only 10 pictures from each of these list will be shown in a 
>block, and within each block is a scale that is shown after each 
>picture presentation:
>
>Set A Pictures: 10
>Set B Pictures: 10
>Scale (repeated per picture shown)
>
>And I hope to play it such that Block 1 --> Block 2 --> Block 3.
>When doing so, I do not want any one picture to be shown three times 
>consecutively within the experiment (i.e., in the three presented blocks).
>
>I hope this helps!
>Thank you.
>On Friday, February 7, 2014 7:32:33 AM UTC-5, JACanterbury wrote:
>i'm not quite clear what you're doing here.
>
>If you only have 2 of each picture in a block, then if you set the 
>triallist to random then you should at most get only 2 in a row, or 
>do the blocks follow immediately on from one another and you're 
>thinking about consecutive pictures across the block boundary?
>
>or perhaps i've missed the point completely :)
>
>On Friday, February 7, 2014 2:06:39 AM UTC, LYT wrote:
>Hi all,
>
>I have an experiment where there are three blocks that each have two 
>sets of the same pictures. I want to semirandomize the pictures such 
>that no one picture in either set is shown three times in a row. 
>Does anyone know how to do this? Please do ask for clarification if 
>I was not clear!
>
>Thank you,
>LYT

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