Comparative Study Group
A Comparative Study Group is an experiment group (of experiment units) drawn from a comparative study unit population.
- AKA: Study Condition.
- Context:
- It can range from being a Treatment Intervention Group to being a Control Group.
- …
- Counter-Example(s):
- See: Condition, Study, Comparative Study.
References
1998
- (Murray, 1998) ⇒ David Murray. (1998). “Design and Analysis of Group Randomized Trials." Oxford University Press. ISBN:0195120361
- QUOTE: The second distinguishing characteristics of a group-randomized trial is that difference units of assignment are allocated to each study condition. This action nests the assignment units within the study conditions. In each of the examples above, one set of schools, communities, or restaurants was assigned to the intervention condition while another set was assigned to the control condition.
The third characteristic of group-randomized trials is that the units of observation are members of the groups that serve as the units of assignment. The nesting of different units of observation in each unit of assignment and different units of assignment in each condition creates the hierarchical structure characteristic of group-randomized trials. Study conditions are the highest aggregate level, units of assignment form an intermediate level, and the units of observation are the lowest aggregate level. In more complex group-randomized trials, there many be even more layers in the hierarchy.
The fourth distinguishing characteristic is that group-randomized trials typically involve only a limited number of assignment units in each study condition. While there are exceptions, it is uncommon to find a group-randomized trial with more than 15 assignment units allocated to each condition and quite common to observe group-randomized trials with fewer than 10 assignments units allocate to each condition.
- QUOTE: The second distinguishing characteristics of a group-randomized trial is that difference units of assignment are allocated to each study condition. This action nests the assignment units within the study conditions. In each of the examples above, one set of schools, communities, or restaurants was assigned to the intervention condition while another set was assigned to the control condition.