Number of trials

Author	Message
YL	YL posted 8 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 6, Visits: 49	Hi, how do I set up in a block attribute that a fixed number of trials are selected from each trial type but are randomly presented within a block? Thanks!
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Dave	Dave posted 8 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	+x YL - Monday, November 27, 2017 Hi, how do I set up in a block attribute that a fixed number of trials are selected from each trial type but are randomly presented within a block? Thanks! You do so via the <block>'s /trials attribute and a noreplace() selection pool. Note that you need to enter the trials into the noreplace() pool in the desired proportions. <block example> / trials = [1-30 = noreplace(a,b)] </block> will result in 15 "a" trials and 15 "b" trials -- equal proportions -- in random order. <block example> / trials = [1-30 = noreplace(a,a,b)] </block> will result in 20 "a" trials and only 10 "b" trials -- a 2:1 ratio -- in random order.
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