When would it be better (under what conditions) to use the non-equivalent groups design? Please also provide a real world example along with you answer
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A non-equivalent control group design is a pretest-posttest design in which the participants are not randomly assigned to groups. There are typically treatment and control groups, but the groups are not generated by random assignment.
Non-equivalent control groups are used when random assignment is impossible, difficult, or impractical. It would be impossible if the groups already existed such as students in two different classes, or if no sampling frame existed (such as with homeless populations). It would be difficult if generating a sampling frame from which to randomize would require a lot of ...
This post describes what a non-equivalent control group design is, details the conditions under which such designs are used, and describe the design's suceptibility to reliability and validity threats.
Quasi Experiment Design: Non Equivalent Groups
Assume that I wanted to test some treatment on A university Program Evaluation students in the School of Public Policy and Management. I decided to give this treatment to groups 1 and 2, and use groups 3 and 4 as a control/comparison group. Remember that you were divided into groups on the basis of your last name: alphabetically the first student went into group one, the second into group two and so on with the fifth student going into group one.
(1) Is this an experimental or quasi-experimental design? Why?
(2) What possible differences might there be between the two groups? (Hint: remember how I originally divided you into groups)
(3) What threats to internal validity would not be controlled by this design?
(4) Do you consider this a good design? Why?
Suppose I gave then decided to evaluate how much students learn about program evaluation in PPM 804N.
(5) What would be a reasonable comparison group? Why?
(6) Delineate your design using X's and O's, and label it with the appropriate name.
(7) Would you use a pre- and post- test? If so, generally define what form that test(s) will take (2-3 sentences - I don't need exact questions!) Will you use the same test pre and post? Why?View Full Posting Details