Item pool confusion

Comments

• sebastiaan

  July 2021 edited July 2021

  Hi @VJay ,

  There are many ways in which you could implement this, but I guess what I would do is define the statements themselves in an inline_script as randomized lists of strings at the very start of the experiment. Something like this:

  import random
  
  category1 = [
      'a statement',
      'another statement',
      # etc.
  ]
  category2 = [
      'a statement',
      'another statement',
      # etc.
  ]
  category3 = [
      'a statement',
      'another statement',
      # etc.
  ]
  
  random.shuffle(category1)
  random.shuffle(category2)
  random.shuffle(category3)
  

  Then, in the block_loop you create a column "category", which indicates the category that you want to sample from. If you want to have a 12/ 8/ 4 ratio, this would simply be implemented by having 12 rows on which the column "category" has the value 1, 8 rows with 2 and 4 rows with 3.

  Finally, at the start of each trial_sequence, you have another inline_script that takes one statement from the correct list and assigns it to an experiment variable. Like this:

  if var.category == 1:
     var.statement = category1.pop()
  elif var.category == 2:
     var.statement = category2.pop()
  elif var.category == 3:
     var.statement = category3.pop()
  else:
     raise ValueError('category should be 1, 2, or 3')  # sanity check
  

  Does that make sense?

  — Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• VJay

  July 2021

  I will try out :) thanks a lot
• VJay

  August 2021

  Dear Sebastiaan,

  I tried your advices now in diffrent ways, but I am still stuck. somehow openSesame is not taking the statements which I defined at the very beginning of the experiment as you said. Is it possible to check somehow if the lists is working ? I also created in the block loop the category. Here I am not complety sure if I understood it right what you suggested. It looks like this (teil2) now in my openSesame profile.

  

  

  • I am getting this error: exception message: category should be 1, 2, or 3

  Can somehelp out again ?

  Kind regards, Vanessa
• lvanderlinden

  August 2021

  Hi Vanessa,

  
  

  The error message comes from the fact that you have some empty rows in your block_loop item. You can remove them by selecting them (from row 7 to 12), right click, "remove 6 row(s.)"

  
  

  Note that in the above example, the categories are divided equally, that is, 33% each.

  
  

  Cheers,

  
  

  Lotje

  Did you like my answer? Feel free to
• lvanderlinden

  August 2021

  Hi @VJay ,

  
  

  To show the statement instead of the category number, you should change the sketchpad content accordingly. Write [statement] instead of [category]

  
  

  

  
  

  Hope this helps!

  
  

  Cheers,

  
  

  Lotje

  Did you like my answer? Feel free to
• VJay

  August 2021

  Dear Lotje,

  Yessss.. there was the logical mistake. Now it works like clockwork!!

  Thank you!!

  
  

  Vanessa