total count for "values"

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total count for "values"

Author	Message
sdandeneau	sdandeneau posted 9 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 37, Visits: 141	Hi, I've created a 'value' (e.g. "response" is : 0 or 1 for each trial) depending on what the subject responds. I would now like to create a second value that computes the sum of the "response" value across all trials at the end of the experiment, i.e. what is the total of "response", in order to easily compute a "final response score". It would be very similar to "trial.sometrial.totaltrialcount/totalcorrect etc..." but I can't seem to figure out this option for a value that I created. Thanks in advance. Stéphane
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Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	You need to create another <values> entry and sum up the response across all trials. <values> / response = 0 / sumresponses = 0 </values> <block myblock> / trials = [1-10=mytrial] </block> <trial mytrial> / stimulusframes = [1=mytext] / validresponse = (32, 37) / ontrialend = [if (trial.mytrial.response == 32) values.response=1 else values.response=0; values.sumresponses+=values.response; ] </trial> <text mytext> / items = ("Press D or K. D -> values.response = 1; K -> values.response = 0") </text> <data> / columns = [trialnum trialcode response latency values.response values.sumresponses] </data>
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sdandeneau	sdandeneau posted 9 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 37, Visits: 141	Wonderful... didn't know about the "+=" function (as in values.sumresponses += values.responses). Thanks again! Stéphane
	Reply Like 36
Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+= is the increment operator. You'll find this and all other available operators covered in the Inquisit documentation's "Operators" topic. Note, however, that one does not even need the increment operator to sum up values across trials. An equivalent way to express values.sumresponses+=values.response using just basic addition would be values.sumresponses=values.sumresponses+values.response Increment and decrement operators merely allow for more concise code.
	Reply Like 39