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Randomizing blocks / trials with no replacement

Karoline — Mon, 26 Nov 2018 07:27:16 GMT

Hi,

I'm trying to create an experiment, in which I want to randomize 3 different blocks (each with different trials) and display a survey (in running number) after each block. I've found a forum discussion (https://www.millisecond.com/forums/Topic23902.aspx), which had some similarities, but instead of displaying the survey with a branch element I want to include it in the experiment element. Furthermore, I want to somehow randomize the experimental blocks and eliminate the possibility that one block is displayed more than once. So at the end, I want the following order of my experiment:
Part 1: randomized Block 1 or Block 2 or Block 3
Survey 1
Part 2: randomized Block 1 or Block 2 or Block 3 (no repeating of the same block as in Part 1)
Survey 2
Part 3: randomized Block 1 or Block 2 or Block 3 (no repeating of the same block as in Part 1 and 2)
Survey 3

Is there any way to write a code for this? Any help will be very much appreciated.

Thanks!

RE: Randomizing blocks / trials with no replacement

Karoline — Mon, 26 Nov 2018 07:27:16 GMT

Thanks for your immediate answer! That really helped a lot - I didn't realize that it's that easy and that I just can randomize separated blocks (1,3,5). So thanks again :)

RE: Randomizing blocks / trials with no replacement

Dave — Mon, 26 Nov 2018 07:14:16 GMT

[quote]

[b]Karoline - Monday, November 26, 2018[/b]

[/quote]

Yes, this is easily possible. It goes like this:

<expt>
/ blocks = [1,3,5 = noreplace(block1, block2, block3); 2 = survey1; 4 =survey2; 6 = survey3]
</expt>