Millisecond Forums

See this recent thread (also works in Inquisit 4): https://www.millisecond.com/forums/FindPost19667.aspx

In case you don't care about exact pre-assignment, you can also simply set /groupassignment to random:

<expt>
/ subjects = (1 of 2)
/ groupassignment = random
...
</expt>

<expt>
/ subjects = (2 of 2)
/ groupassignment = random
...
</expt>

There will be no relationship between the entered subject id and the administered condition then -- assignment will be strictly random.

(for some reason my first post does not show up)

Thanks for the suggestions.
I am somewhat concerned about equal assignment of conditions, so I am a bit apprehensive to use random assignment.

The other solution you suggested (precondition) would work if I could do something like:
<include>
/ precondition = [script.subjectid < "5000" ]
/ file = "condition_1.iqx"
</include>

We have generated random IDs for participants, but they can be sorted. One more question, can precondition be included in the block element so that I don't have to separate the two conditions into separate files? Or perhaps I could use branch for that? Currently I have for condition 1:

<expt>
/ subjects =  (1 of 2)
/ groupassignment = subjectnumber
/ preinstructions = (welcome_p)
/ blocks = [1 = consent_b; 2 = practice_b; 3 = subprime_trust_b; 4 = playerA_b; 5 = donation_b]
</expt>

See https://www.millisecond.com/forums/FindPost19691.aspx