By xizhouxie - 11/13/2020
I have 6 types of trials and I want them randomly displayed in one block so that I get 150 trials total:
25 Chem_correct,
25 Chem_incorrect,
25 Engl_correct,
25 Engl_incorrect,
12/13Chem_correct_mixed,
13/12Chem_incorrect_mixed, adding to 25 total
12/13Engl_correct_mixed,
13/12Engl_incorrect_mixed, adding to 25 total
Picture:
Chem_correct and Chem_incorrect share a picture element with 50 items,
Engl_correct and Engl_incorrect share a picture element with 50 items,
Chem_correct_mixed and Chem_incorrect_mixed share a picture element with 25 items,
Engl_correct_mixed and Engl_incorrect_mixed share a picture element with 25 items,
All picture elements are set to noreplacenorepeat
CODE:
This is what I have in the block:
/ trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect,
Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect,
Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)]
But instead of getting
25 Chem_correct,
25 Chem_incorrect,
25 Engl_correct,
25 Engl_incorrect,
I would get 26, 24, ...
How do I fix that?
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By xizhouxie - 11/13/2020
+xI have 6 types of trials and I want them randomly displayed in one block so that I get 150 trials total: 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, 12/13Chem_correct_mixed, 13/12Chem_incorrect_mixed, adding to 25 total 12/13Engl_correct_mixed, 13/12Engl_incorrect_mixed, adding to 25 total Picture: Chem_correct and Chem_incorrect share a picture element with 50 items, Engl_correct and Engl_incorrect share a picture element with 50 items, Chem_correct_mixed and Chem_incorrect_mixed share a picture element with 25 items, Engl_correct_mixed and Engl_incorrect_mixed share a picture element with 25 items, All picture elements are set to noreplacenorepeat CODE: This is what I have in the block: / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] But instead of getting 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, I would get 26, 24, ... How do I fix that?
just adding that when i get the 26, 24, vs 25 trials all around, I'm also having pictures repeat, which is not what we want.
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By Dave - 11/13/2020
+x+xI have 6 types of trials and I want them randomly displayed in one block so that I get 150 trials total: 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, 12/13Chem_correct_mixed, 13/12Chem_incorrect_mixed, adding to 25 total 12/13Engl_correct_mixed, 13/12Engl_incorrect_mixed, adding to 25 total Picture: Chem_correct and Chem_incorrect share a picture element with 50 items, Engl_correct and Engl_incorrect share a picture element with 50 items, Chem_correct_mixed and Chem_incorrect_mixed share a picture element with 25 items, Engl_correct_mixed and Engl_incorrect_mixed share a picture element with 25 items, All picture elements are set to noreplacenorepeat CODE: This is what I have in the block: / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] But instead of getting 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, I would get 26, 24, ... How do I fix that? just adding that when i get the 26, 24, vs 25 trials all around, I'm also having pictures repeat, which is not what we want.
/ trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect,
Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect,
Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)]
You're sampling the 12 trial elements *in equal proportions*. 150/12 = 12.5. There obviously can be no such thing as 0.5 of a trial, hence you get imbalances. Enter the trial elements in the proportions you want into the noreplace selection pool.
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By xizhouxie - 11/13/2020
+x+x+xI have 6 types of trials and I want them randomly displayed in one block so that I get 150 trials total: 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, 12/13Chem_correct_mixed, 13/12Chem_incorrect_mixed, adding to 25 total 12/13Engl_correct_mixed, 13/12Engl_incorrect_mixed, adding to 25 total Picture: Chem_correct and Chem_incorrect share a picture element with 50 items, Engl_correct and Engl_incorrect share a picture element with 50 items, Chem_correct_mixed and Chem_incorrect_mixed share a picture element with 25 items, Engl_correct_mixed and Engl_incorrect_mixed share a picture element with 25 items, All picture elements are set to noreplacenorepeat CODE: This is what I have in the block: / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] But instead of getting 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, I would get 26, 24, ... How do I fix that? just adding that when i get the 26, 24, vs 25 trials all around, I'm also having pictures repeat, which is not what we want. / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] You're sampling the 12 trial elements *in equal proportions*. 150/12 = 12.5. There obviously can be no such thing as 0.5 of a trial, hence you get imbalances. Enter the trial elements in the proportions you want into the noreplace selection pool.
that makes total sense. so I need to spell out the 150 trials total?
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By Dave - 11/13/2020
+x+x+x+xI have 6 types of trials and I want them randomly displayed in one block so that I get 150 trials total: 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, 12/13Chem_correct_mixed, 13/12Chem_incorrect_mixed, adding to 25 total 12/13Engl_correct_mixed, 13/12Engl_incorrect_mixed, adding to 25 total Picture: Chem_correct and Chem_incorrect share a picture element with 50 items, Engl_correct and Engl_incorrect share a picture element with 50 items, Chem_correct_mixed and Chem_incorrect_mixed share a picture element with 25 items, Engl_correct_mixed and Engl_incorrect_mixed share a picture element with 25 items, All picture elements are set to noreplacenorepeat CODE: This is what I have in the block: / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] But instead of getting 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, I would get 26, 24, ... How do I fix that? just adding that when i get the 26, 24, vs 25 trials all around, I'm also having pictures repeat, which is not what we want. / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] You're sampling the 12 trial elements *in equal proportions*. 150/12 = 12.5. There obviously can be no such thing as 0.5 of a trial, hence you get imbalances. Enter the trial elements in the proportions you want into the noreplace selection pool. that makes total sense. so I need to spell out the 150 trials total?
If I'm reading your original description correctly, for "chem mixed" and "engl mixed", two distinct <trial> elements together form a "type", and you want 25 trials of each "type", but don't care if the within-type distribution is 12 x subtrial A and 13 x subtrial B, or 13 x subtrial A and 12 x subtrial B.. If so, the proper way to do this would be to create a dummy <trial> element for each type that you sample at the block-level, and have the actual trials in a <list> that the dummy trial /branch'es to. I.e.
<block example>
/ trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect,Chem_mixed,Engl_mixed)]
</block>
with
<trial chem_mixed>
/ trialduration = 0
/ recorddata = false
/ branch = [
list.chem_mixed_trials.nextvalue;
]
</trial>
// with poolsize 24 and equal proportions, we're guaranteed to get 12 x chem_correct_mixed and 12 x chem_incorrect_mixed
// the 25th sample will randomly be either chem_correct_mixed or chem_incorrect_mixed
<list chem_mixed_trials>
/ items = (trial.chem_correct_mixed, trial.chem_incorrect_mixed)
/ poolsize = 24
</list>
<trial engl_mixed>
/ trialduration = 0
/ recorddata = false
/ branch = [
list.engl_mixed_trials.nextvalue;
]
</trial>
<list engl_mixed_trials>
/ items = (trial.engl_correct_mixed, trial.engl_incorrect_mixed)
/ poolsize = 24
</list>
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By xizhouxie - 11/13/2020
+x+x+x+x+xI have 6 types of trials and I want them randomly displayed in one block so that I get 150 trials total: 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, 12/13Chem_correct_mixed, 13/12Chem_incorrect_mixed, adding to 25 total 12/13Engl_correct_mixed, 13/12Engl_incorrect_mixed, adding to 25 total Picture: Chem_correct and Chem_incorrect share a picture element with 50 items, Engl_correct and Engl_incorrect share a picture element with 50 items, Chem_correct_mixed and Chem_incorrect_mixed share a picture element with 25 items, Engl_correct_mixed and Engl_incorrect_mixed share a picture element with 25 items, All picture elements are set to noreplacenorepeat CODE: This is what I have in the block: / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] But instead of getting 25 Chem_correct, 25 Chem_incorrect, 25 Engl_correct, 25 Engl_incorrect, I would get 26, 24, ... How do I fix that? just adding that when i get the 26, 24, vs 25 trials all around, I'm also having pictures repeat, which is not what we want. / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect, Chem_correct_mixed,Chem_incorrect_mixed,Engl_correct_mixed,Engl_incorrect_mixed)] You're sampling the 12 trial elements *in equal proportions*. 150/12 = 12.5. There obviously can be no such thing as 0.5 of a trial, hence you get imbalances. Enter the trial elements in the proportions you want into the noreplace selection pool. that makes total sense. so I need to spell out the 150 trials total? If I'm reading your original description correctly, for the "chem mixed" and "eng mixed", two distinct <trial> elements together form a "type", and you want 25 trials of each "type", but don't care if the within-type distribution is (12 x subtrial A and 13 x subtrial B, or 13 x subtrial A and 12 x subtrial B). If so, the proper way to do this would be to create a dummy <trial> element for each type that you sample at the block-level, and have the actual trials in a <list> that the dummy trial /branch'es to. I.e. <block example> / trials = [1-150 = noreplace(Chem_correct,Chem_incorrect,Engl_correct,Engl_incorrect,Chem_mixed,Engl_mixed)] </block> with <trial chem_mixed> / trialduration = 0 / recorddata = false / branch = [ list.chem_mixed_trials.nextvalue; ] </trial> // with poolsize 24 and equal proportions, we're guaranteed to get 12 x chem_correct_mixed and 12 x chem_incorrect_mixed // the 25th sample will randomly be either chem_correct_mixed or chem_incorrect_mixed <list chem_mixed_trials> / items = (trial.chem_correct_mixed, trial.chem_incorrect_mixed) / poolsize = 24 </list> <trial engl_mixed> / trialduration = 0 / recorddata = false / branch = [ list.engl_mixed_trials.nextvalue; ] </trial> <list engl_mixed_trials> / items = (trial.engl_correct_mixed, trial.engl_incorrect_mixed) / poolsize = 24 </list>
Perfect. Thank you so much. This is extremely clear.
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