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  1. #1
    Join Date
    Jun 2006
    Posts
    18

    randomization mistake

    Hi.

    I ran a study last Fall where I administered a Stroop. In this particular version I needed to randomize both within and between groups. That is, I had to randomize incongruent and congruent trials within blocks, but also needed to present two separate types of blocks that needed to appear in a specific order one after the other--what I called cong-majority and incong-majority blocks. Please see the attached file. I thought I did this properly (seems straightforward), but when I looked at the data, it became clear, that although the within-group randomization worked, the separate blocks were not presented separately--both types of blocks were interspersed. Could you please let me know where I went wrong?

    Thanks!
    Attached Files Attached Files

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