RE: noreplace unequal categories

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noreplace unequal categories

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olciak	olciak posted 11 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 2, Visits: 8	Hello, I'm recently working on the procedure in which I have to display items without replacement from unequal categories. qFURNITURE_S has 2 items, qFURNITURE_M has 3 items and qFURNITURE_W has 5 items. I tried noreplace and noreplacenorepeat command and both of them don't work (so some of the items are displayed more than once). Also at the trial level I used both commands (noreplace and noreplacenorepeat ) to make them unrepeatable. Below I pasted the part of the script. Thanks for your help in advance. <block FURNITURE> /trials = [1=firstFURNITURE; 2-11=noreplacenorepeat(qFURNITURE_S,qFURNITURE_M,qFURNITURE_W)] /bgstim = (categorization,FURNITUREhead) </block> Tags nonreplace unequal categories
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	/ trials = [1-8=noreplace(a,b)] means sample trials a and b in equal proportions. You'll end up with 4 a-trials and 4-b-trials in random order. With / trials = [1-9=noreplace(a,a,b)] you'll end up with twice as many a-trials compared to b-trials; there'll be 6 x a and only 3 x b, again in random order. The same applies to your situation: You ought to enter trials in the selection pool in the proportions you need. You'll also find this covered in the documentation topic for the /trials attribute and its examples: The following block randomly selects either testtrial or distractortrial for each of its 12 trials. The testtrial is run exactly 8 time and distractortrial is run 4 times. <block myblock> / trials=[1-12=noreplace(testtrial, testtrial, distractortrial)] </block>
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olciak	olciak posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 2, Visits: 8	Thank you very much for your replay! Best, Olga
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