Randomly present a subset of items

[hailinguist]

Hi Jeremy,

I’m implementing an experiment using the native IBEX, as in the following code.

[["exp.caus.tran.1", 101], "Maze", {s:"What did the clown pop at the party?", a:"x-x-x sick gal tuned ben pre draw thank?"}],

It’s a 2*2 design so it’ll presumably have four groups/lists. However, out of the 24 critical items, I only want to show 10 of them randomly to the participants. I wanna do the same for fillers. I have 90 of them want it to randomly select 30 each time. May I know how this can be implemented? Thank you!

Best,
Hailin Hao

[Jeremy]

Hi Hailin,

You could use the custom pick function. Assuming all your critical items have labels that start with exp. and all your filler items have labels that start with fil. it would look something like this:

var shuffleSequence = seq(
  shuffle(
    pick( randomize(startsWith("exp.")) , 10),
    pick( randomize(startsWith("fil.")) , 30)
  )
)

Jeremy

[Author]

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