Millisecond Forums » Millisecond Forums » Inquisit 4 » Between-groups randomization online

Between-groups randomization online

Yolandindupsych@gmail.com — Tue, 27 Oct 2015 10:04:18 GMT

Hi there,

Background Info: I have created 1 script with three different tasks within the script: An IAT (experiment 1), another responding task (experiment 2), and some "slider"/"textbox" questions (experiment 3). Participants will firstly use the university webpage/platform to answer some questions, then will be directed to Inquisit for the responding tasks, and thereafter will be re-directed to the university webpage. Participants' get a session identity (created by the university webpage e.g. looks like Ms8M43W621olz1Yg1b2A15p2Q60x5T70l5N98jod5D54hN745am6Pb).

Within my script, I want to randomize between-groups so that Group 1 does the sequence of experiments 1,2,3 and Group 2 does the sequence of experiments 2,1,3. It seems that the batch option is not a good one, as I can only load 1 file/experiment at a time (and as I understand, for a batch I would need to upload 3 different experiments and the batch command file online).

Question: Which command is best to randomize participants into these 2 groups (as stated above) if I only upload 1 script/file onto the web?

Kind Regards,

RE: Between-groups randomization online

Yolandindupsych@gmail.com — Tue, 27 Oct 2015 10:04:18 GMT

Hi there,
Thanks for the speedy reply!! I will try this out.

RE: Between-groups randomization online

Dave — Tue, 27 Oct 2015 05:07:54 GMT

> It seems that the batch option is not a good one, as I can only load 1 file/experiment at a time (and as I understand, for a batch I > would need to upload 3 different experiments and the batch command file online).

This is incorrect. You can use <batch> elements just fine and you only need a single license. Create a file containing the two <batch> elements representing the two different orders. The file containing those <batch> elements is the one you ought to register as your active web script.

<batch>
/ file = "1.iqx"
/ file = "2.iqx"
/ file = "3.iqx"
/ subjects = (1 of 2)
/ groupassignment = groupnumber
</batch>

<batch>
/ file = "2.iqx"
/ file = "1.iqx"
/ file = "3.iqx"
/ subjects = (2 of 2)
/ groupassignment = groupnumber
</batch>

RE: Between-groups randomization online

Yolandindupsych@gmail.com — Tue, 27 Oct 2015 00:57:59 GMT

Just to be more precise, my current script looks like this:

<expt 1>
/ blocks = [1=block1; 2=block2; 3=block3; 4=block4; 5=block5; 6=block6; 7=block7; 8=block8]
</expt>

<expt 2>
/ blocks = [1=targetcompatiblepractice; 2=attributepractice; 3=compatibletest1; 4=compatibletest2; 5=targetincompatiblepractice; 6=incompatibletest1; 7=incompatibletest2]
</expt>

<expt 3>
/ blocks = [1=slider]
</expt>