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Thread: Randomization

  1. #1
    Join Date
    Jan 2008
    Posts
    4

    Randomization

    I have four blocks of questions to randomize so that blocks 1 and 4 randomize and blocks 2 and 3 randomize. I can get the questions within each block to move appropriately, but the blocks are randomizing so that I get orders like 2 4 3 1. I assigned blocks 1 and 4 WGR values of 1 and blocks 2 and 3 WGR values of 2, but they keep randomizing with each other. What do I do?

  2. #2
    Join Date
    Nov 2005
    Posts
    3,328
    Think it might be a lot easier if I could see the file. Would you mind sending or attaching it?

  3. #3
    Join Date
    Jan 2008
    Posts
    4

    file

    This is the questionnaire file.
    Attached Files Attached Files

  4. #4
    Join Date
    Nov 2005
    Posts
    3,328
    Ah, ok, this helps a lot. First, let's talk about BGR only. It appears you have 5 blocks (AB1 through AB5). It also appears that you want the order of these blocks to occur in a random order with the exception of the 5th which you want to remain constant as the final block. So you might get something like one of these orders:

    AB2,AB3,AB1,AB4,AB5
    AB4,AB1,AB2,AB3,AB5
    AB3,AB4,AB1,AB2,AB5

    etc.

    Is this part of the randomization correct or is this one of the problems?

  5. #5
    Join Date
    Jan 2008
    Posts
    4
    No, that's one of the problems. I want AB1 and AB4 to randomize with each other and AB2 and AB3 to randomize with each other, but not all of the four randomized together.

  6. #6
    Join Date
    Nov 2005
    Posts
    3,328
    I see the problem. You can't have multiple sets of BGR assignments within a single questionnaire. Normally you could break the items up into multiple questionnaires but you have the added difficulty of randomly assigning the instructions across the multiple blocks.

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