PennController for IBEX › Forums › Support › Choosing subet of items to present › Reply To: Choosing subet of items to present
Hi Ana,
I’m sorry, I seem to have missed your previous post. By default, group assignment in (PC)Ibex experiments relies on an internal counter, which is increased whenever a submission is complete. Two people starting your experiment before anyone has completed it will be assigned the same group. You can change that behavior by using SetCounter
, for example.
Regarding how to read the results lines, here’s an example:
1619789055,744afe76cfc47b2a84daec2adc3d2d3b,PennController,0,0,unlabeled,NULL,PennController,0,_Trial_,Start,1619789053581,NULL 1619789055,744afe76cfc47b2a84daec2adc3d2d3b,PennController,0,0,unlabeled,NULL,Button,Start reading,Click,Click,1619789054361,NULL 1619789055,744afe76cfc47b2a84daec2adc3d2d3b,PennController,0,0,unlabeled,NULL,Controller-DashedSentence,DashedSentence,1,hello,1619789055108,230,false,hello world,Any addtional parameters were appended as additional columns 1619789055,744afe76cfc47b2a84daec2adc3d2d3b,PennController,0,0,unlabeled,NULL,Controller-DashedSentence,DashedSentence,2,world,1619789055108,237,false,hello world,Any addtional parameters were appended as additional columns 1619789055,744afe76cfc47b2a84daec2adc3d2d3b,PennController,0,0,unlabeled,NULL,Button,Finish,Click,Click,1619789055629,NULL 1619789055,744afe76cfc47b2a84daec2adc3d2d3b,PennController,0,0,unlabeled,NULL,PennController,0,_Trial_,End,1619789055635,NULL
The very beginning of the trial happened at timestamp 1619789053581
, then I clicked the “Start reading” button at timestamp 1619789054361
(780ms later). I finished reading the DahsedSentence controller at timestamp 1619789055108
(747ms after I clicked the button) and finally clicked the “Finish” button at timestamp 1619789055629
. The trial ended at timestamp 1619789055635
(it took 4ms for the engine to wrap things up).
Now, I spent 230ms reading the word “hello” and 237ms reading the word “world,” so I could calculate their display timestamps by subtracting those numbers to the DashedSentence controller’s timestamp, which would give 1619789055108-237=1619789054871
for “world” and 1619789054871-230=1619789054632
for “hello”
Jeremy