groupassignment attribute

The groupassignment attribute determines how participants are assigned to between-subject conditions.

Member of

Syntax

/ groupassignment = assignment

Parameters

assignment

One of the following values:

Value	Description
groupnumber	Assignment is based on the group number.
random	Assignment is random.
subjectnumber	Assignment is based on the subject number.

Remarks

Between-subject groups can be defined using the expt or batch elements. Participants can be assigned to between-subjects groups based on the numeric subject id entered when launching the script, or by random assignment. This attribute specifies which method to use. By default, the subject id is used.

Examples

The following randomly assigns participants into one of 2 treatment conditions:


			<expt conditionA>
/ subjects = (1 of 2)
/ groupassignment = random
/ blocks = [1=practice; 2=treatmentA; 3=test]
</expt>
			

			

			<expt conditionB>
/ subjects = (2 of 2)
/ groupassignment = random
/ blocks = [1=practice; 2=treatmentB; 3=test]
</expt>