subject_nr

TERL3S6

Good morning,

We are French students and we would like to use jatos because we have to do a study as an important work for a class in our university.

However we have a problem. On open sesam we use [subject_partiy]= even and [subject_parity]=odd, and we use [subject_nr]%4=1 or [subject_nr]%4=2 and [subject_nr]%4=3 or [subject_nr]%4=0.

But when we send a single link with JATOS we don’t have good number of subject_nr. For example with 5 attempts we have two

subject_nr 3, two subject_nr 0, one subject_nr 1, but we don’t have subject_nr 2 ; And it’s really important we have as many participants in each of the fourth condition.

Could you explain to us how we can do it ?

 

Thanks a lot for your help

lvanderlinden

Dear @TERL3S6 and colleagues,

When running your experiment via JATOS, you could indicate the possible subject numbers here:

Note, however, that the subject numbers are generated randomly. Therefore, by chance, you could end up with an unequal number of participants per subject number.

Therefore, unfortunately, if you want to be certain that your participants are equally divided across your four conditions, I think you should generate four separate opensesame scripts (and, subsequently, four separate links on JATOS).

Hope this clears things up a bit.

Cheers,

Lotje

lvanderlinden

@TERL3S6 , we just discovered that there actually is a way to implement counterbalancing properly. See this discussion:

• https://forum.cogsci.nl/discussion/comment/22691/#Comment_22691

It's not very userfriendly though (yet), so feel free to choose for the option of creating different experiments for each condition...