Empirisoft Support

    Welcome to Empirisoft Support
Results 1 to 5 of 5

Thread: two blocks of between group randomization

  1. #1
    Join Date
    Apr 2007
    Posts
    13

    two blocks of between group randomization

    hi,
    i need to have 2 blocks of bgr. that is, 3 groups should be randomized, then a new block starts and 10 other groups need to be randomized, but there must be NO randomization between the 3 groups and the 10 groups (just to explain: the first 3 groups belong to a practice session and the other 10 groups are the actual experiment, so i can't have trials of both types mixed).
    thanks for your help (and sorry for the "bombing" of questions)

  2. #2
    Join Date
    Nov 2005
    Posts
    3,328
    I'm surprised--I think I actually understand this! If so, the answer is no, you can't do that. That would essentially be like having two separate levels of BGR. Like "randomize these blocks.. ok, now randomize these blocks." Would be a nice feature though. In the mean time, you would need a separate input file for your practice blocks.

  3. #3
    Join Date
    Apr 2007
    Posts
    13

    ok

    in that case can i run several input files together (so that i won't have to be present and switch files manually in the middle for every participant)

  4. #4
    Join Date
    Jan 2010
    Posts
    2
    I'm guessing this needs to be done by running the multiple DirectRT input files from MediaLab? Is this the only way? I have MediaLab and can do this but would prefer to avoid any potential glitches that might arise from jumping in and out of a DirectX environment or in and out of whatever display setting you've established in the DirectRT style file. I'll give it a try. Assume there were no problems if this is the last you hear from me on it.

  5. #5
    Join Date
    Nov 2005
    Posts
    3,328

Similar Threads

  1. Too much Randomization
    By L4lab in forum DirectRT Older Versions: Troubleshooting
    Replies: 2
    Last Post: 03-31-2007, 05:18 PM
  2. Presenting multiple text stimuli w/ randomization?
    By sangoh in forum DirectRT Older Versions: How Do I...
    Replies: 1
    Last Post: 03-26-2007, 09:44 AM
  3. Fixed trials within randomized (BGR) blocks?
    By maya in forum DirectRT Older Versions: How Do I...
    Replies: 3
    Last Post: 01-22-2007, 04:13 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •