Randomization

[exp]

Hi Jeremy,

I have a problem which can be easily solved (I believe)- but I am unable to do so.

For my experiment, there are 4 practice items and 36 critical items following. I would like to randomize the trials – but I’d like to keep 4 practice item constant. I’d be great if I can randomize practice items within “Practice” items and 36 critical items within “Critical” items

When I tried Sequence( randomize(“Experiment”)), it randomized all 40 trials and I lost the practice sequence.
I also could not quite follow this: https://github.com/addrummond/ibex/blob/master/docs/manual.md#seq-randomize-and-shuffle

Could you help me with the code?
Thank you

[Jeremy]

Hi,

Did you label your trials appropriately so you could do something like Sequence( randomize("practice") , randomize("critical") )?

Jeremy

[exp]

Both practice items and critical items are within the same csv file – so they are both under “Experiment” label. So now I understand that if I have two separate .csv files (one for practice items and one for critical items) – then the problem will be solved.

I just wonder is there a way to do the randomization while keeping them within the same .csv and under “Experiment” label?

Thank you so much

[Jeremy]

It doesn’t matter how many CSV files you have, just label your trials differently. Say you have a Condition column in your table that alternates between Practice and Critical:

Sequence( randomize("Experiment-Practice") , randomize("Experiment-Critical") )

Template( row => newTrial( "Experiment-"+row.Condition , // ...

Jeremy

[exp]

Thank you Jeremy, problem solved!

[Author]

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