Hi there,

I conducted an experiment last year where participants did the OSPAN and n-back tasks before doing a Qualtrics questionnaire. They were randomly assigned to do one or the other first using the following script:
<batch>
/ subjects = (1 of 2)
/ groupassignment = random
/ file = "shortfrenchversionnback.iqx"
/ file = "shortfrenchversionospan.iqx"
</batch>

//order 2: B -> A -> Qualtrics
<batch>
/ subjects = (2 of 2)
/ groupassignment = random
/ file = "shortfrenchversionospan.iqx"
/ file = "shortfrenchversionnback.iqx"
</batch>


We are analyzing the data and are a bit puzzled by identifying the group ID. Is it correct that group ID 1 = did the n-back first and group ID 2 = did OSPAN first? Some of the participant start times seem to not line up with this and so I am not sure if I have correctly understood.

Thanks for your help!

> Is it correct that group ID 1 = did the n-back first and group ID 2 = did OSPAN first?

No, you assigned the order of the tasks randomly per

<batch>
/ subjects = (1 of 2)
/ groupassignment = random
/ file = "shortfrenchversionnback.iqx"
/ file = "shortfrenchversionospan.iqx"
</batch>

//order 2: B -> A -> Qualtrics
<batch>
/ subjects = (2 of 2)
/ groupassignment = random
/ file = "shortfrenchversionospan.iqx"
/ file = "shortfrenchversionnback.iqx"
</batch>

The order was not based on the group ID. If it had been, you would have had to specify

<batch>
/ subjects = (1 of 2)
/ groupassignment = groupnumber
/ file = "shortfrenchversionnback.iqx"
/ file = "shortfrenchversionospan.iqx"
</batch>

//order 2: B -> A -> Qualtrics
<batch>
/ subjects = (2 of 2)
/ groupassignment = groupnumber
/ file = "shortfrenchversionospan.iqx"
/ file = "shortfrenchversionnback.iqx"
</batch>

Dear Dave,

Thank you for your reply. What does the groupID represent? Is there a way to identify the order, other than looking at the start times of each individual participant?
Best,
Julia

The group id, in your case, probably does not represent anything, since neither the <batch> nor any of the two tasks involved made use of the group id to assign any between-subjects conditions. Since the random assignment you used in your <batch> elements isn't logged anywhere, you need to go through the start times to determine the order a given participant received.

Hi Dave,

I see, thank you for explaining. Is there a way to apply the formula listed in this topic to the data?
https://www.millisecond.com/forums/Topic13856.aspx