Millisecond Forums » Millisecond Forums » Inquisit 5 » Equal pairs of subjects in each experiment

Equal pairs of subjects in each experiment

splukkel — Mon, 13 Mar 2017 13:57:57 GMT

Hi!

I have an IAT with 4 different conditions in the experiments.
I read that when I put my script online on inquisit web, I can choose how the subject assignment for each group is done. Right?

But what do I have to put in my script?
Now it says / groupassignment = random

But I want that my first subject is getting the first experiment, the second subject the second exp., the third subject the third exp.......

How do I do that?

RE: Equal pairs of subjects in each experiment

Dave — Mon, 13 Mar 2017 13:57:57 GMT

[quote]

[b]splukkel - Monday, March 13, 2017[/b]

Ah, one other question.

Does every subject gets it's own IDnumber? So I can see in de data which of the 4 condition they had?

[/quote]

> Does every subject gets it's own IDnumber

Yes (unless you deliberately configured the web experiment otherwise, which would require jumping through some hoops, i.e. it's unlikely that you did). Selecting either randomly generated or sequentially generated subject ids should be fine, and the subject id will be captured in the data files' subject / script.subjectid column.

> So I can see in de data which of the 4 condition they had?

Yes. The group id is captured in the group / script.groupid column (which you'll want to make sure is logged; check your <data> and <summarydata> elements' /columns attributes). You can derive the condition administered based on the groupid per https://www.millisecond.com/forums/Topic13856.aspx

RE: Equal pairs of subjects in each experiment

splukkel — Mon, 13 Mar 2017 13:44:23 GMT

Ah, one other question.

Does every subject gets it's own IDnumber? So I can see in de data which of the 4 condition they had?

RE: Equal pairs of subjects in each experiment

splukkel — Mon, 13 Mar 2017 13:40:14 GMT

Thank you very much! Now I understand :).

RE: Equal pairs of subjects in each experiment

Dave — Mon, 13 Mar 2017 13:36:26 GMT

[quote]

[b]splukkel - Monday, March 13, 2017[/b]

[/quote]

You should specify /groupassignment = groupnumber in the script and configure your launch page to generate sequential group numbers.

Then every time a participant visits the launch page, the page will give her/him a sequential groupnumber i.e. 1 for the 1st visitor, 2 for the 2nd visitor, 3 for the 3rd, 4 for the 4th, 5 for the 5th and so forth.

Per https://www.millisecond.com/forums/Topic13856.aspx the person with id 1 gets the 1st condition, id 2 gets the 2nd condition, id 3 gets the 3rd condition, 4 gets the 4th condition, and then again 5 gets the 1st condition, id 6 gets the 2nd condition, and so forth. I.e. the condition assignment is groupnumber *modulo* the number of conditions.