By sdandeneau - 11/12/2015
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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By Dave - 11/12/2015
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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By sdandeneau - 11/13/2015
Wonderful... didn't know about the "+=" function (as in values.sumresponses += values.responses).
Thanks again!
Stéphane
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By Dave - 11/14/2015
+= 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.
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