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Thread: Too much Randomization

  1. #1
    Join Date
    Mar 2007

    Too much Randomization

    I am working in DirectRT and I am attempting to do RWG. While DirectRT does randomize the tasks, it does so in such a way that it repeats one line instead of randomizing the four and using each of those four only once (as we would like it to do).

    For example:
    ---The Input---
    1 1 0 1 triangle
    1 2 0 1 ball 
    1 3 0 1 heart 
    1 4 0 1 star
    ---The Resulting Orders----
    Test 1 Test 2 Test 3 
    -triangle -heart -star 
    -star -star -ball 
    -heart -ball -triangle 
    -triangle -star -triangle
    Is there a way to randomize the trials such that the results would appear as:
    Test 1 Test 2 Test 3, etc. 
    -triangle -heart -star 
    -heart -star -ball 
    -heart -ball -triangle 
    -ball -triangle -heart
    so that each trial is randomized but only appears once in a test?
    Attached Files Attached Files
    Last edited by jarvis24; 03-27-2007 at 06:08 AM.

  2. #2
    Join Date
    Nov 2005
    Yes, there is. Remember that any items sharing the same RWG value go into the same pool for randomization. Checking your input file, see that you have a "1" assigned to all of your trials across all of your blocks? Try, instead, using the same value only within blocks. So, e.g., try using an RWG value of "2" in your second block, "3" in your third block and so on. Let me know if that helps!


  3. #3
    Join Date
    Mar 2007

    That worked.

    Ah-ha! Your suggestion worked. Thank you!

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