[solved] randomizing the order of 3 tasks x 2 conditions and 6 questions

Comments

• sebastiaan

  February 2014 edited 8:39AM

  How do I randomize the tasks (3 'sequences' within the 'experiment')?

  One way is to add the your three sequences to a 'container' sequence and loop, like so:

  

  Then you define a variable sequence_nr in container_loop and give it the values 1, 2, and 3 (so three cycles). Finally, you use this variable to run only one sequence for each cycle of container_loop, with the following run-if statements for sequence1, sequence2, and sequence3:

  [sequence_nr] = 1
  [sequence_nr] = 2
  [sequence_nr] = 3
  

  This effectively randomizes the order of container_sequence. Does that make sense?

  How(where) do I implement these multiple choice questions so that all are possible but only one occurs following one of my conditions as I have described them? How do I randomize the occurrence of my multiple choice questions in this format?

  This will require a little Python scripting. At the beginning of your experiment, define all the questions and response options that you want to present. For example:

  # NOTE: This script needs to be in the prepare phase, somewhere at the beginning of the experiment
  from random import shuffle
  # Define a list of multiple choice questions. Each question is actually a
  # tuple, consisting of the question, the first option, and the second option.
  mc_list = [
      ('Question 1', 'Option 1A', 'Option 1B'),
      ('Question 2', 'Option 2A', 'Option 2B'),
      ]
  # Randomize the list
  shuffle(mc_list)
  

  Now, just before the form_multiple_choice plug-in, get one of the questions from the list:

  # NOTE: This script should precede the form and be placed in the prepare phase.
  # Get and remove (i.e. pop) one question from the list of questions
  question, option_A, option_B = mc_list.pop()
  # Set the variables, so that they can be used in the form and are logged by
  # OpenSesame
  exp.set('_question', question)
  exp.set('_option_A', option_A)
  exp.set('_option_B', option_B)
  

  Now you can simply use the square-brackets notation to use [_question], [_option_A], and [_option_B] in your form_multiple_choice to define the question and response options.

  Cheers,
  Sebastiaan

  
  
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• pool

  February 2014 edited 8:39AM

  Thanks for the help, it was very much appreciated!