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Thread: Multiple Randomizations in an Experiment (case 1992)

  1. #1
    Join Date
    Sep 2012
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    4

    Multiple Randomizations in an Experiment (case 1992)

    Hello,

    I'm trying to randomize multiple items in my experiment and they keep being mixed together instead. Basically, I have 5 video files which I want randomized, and 5 questionnaires that I want randomized; but I need the order to stay: video, questionnaire, video, questions, etc.

    I also have two conditions, so I've assigned the different sets different numbers within each condition. So condition one's videos are all numbered 1 in BGR and it's questionnaires are numbered 2 and conditions two's videos are 3 and questionnaires are 4.

    What is happening instead of all the 1s, 2s, 3s, and 4s randomizing separately is that 1s and 2s are mixing together and 3 and 4s are mixing together.

    How do I get MediaLab to keep items with different BGR numbers separated but presented in random orders?

  2. #2
    Join Date
    Sep 2012
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    4
    btw, I'm running MediaLab 2010.

  3. #3
    Join Date
    Aug 2012
    Posts
    75
    In the .exp file you could list movie1, que1, movie2, que2, movie3, que3, etc. Assign each of the movies a *WGR* value of 1 and each of the movie files a WGR value of 2. That will keep the order of movie, que, movie, que, etc., but will randomize the order in which they occur. Did I understand your question?

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