What is a non equivalent group?

A non-equivalent group design is one where the assignment of participants to groups is not controlled by the investigator. When group assignment is not controlled there is a significant threat to internal validity. Since group assignment is not random, there is a chance that the groups are not similar.

What is non equivalent control group design example?

Imagine, for example, that students in one school are given a pretest on their attitudes toward drugs, then are exposed to an anti-drug program, and finally, are given a posttest. Students in a similar school are given the pretest, not exposed to an anti-drug program, and finally, are given a posttest.

What is equivalent group research?

In the simplest type of experiment, we create two groups that are “equivalent” to each other. One group (the program or treatment group) gets the program and the other group (the comparison or control group) does not. In all other respects, the groups are treated the same.

What is the difference between quasi and non experimental?

Quasi-Experiment: A quasi-experimental design is an empirical study, almost like an experimental design but without random assignment. Non-experimental research tends to have a high level of external validity, meaning it can be generalized to a larger population.

What is non equivalent groups design?

a quasi-experimental design in which the responses of a treatment group and a control group are compared on measures collected at the beginning and end of the research.

What are the 5 types of non-experimental research design?

Non-experimental research falls into three broad categories: cross-sectional research, correlational research, and observational research.

What are the different types of nonequivalent groups?

A nonequivalent groups design, then, is a between-subjects design in which participants have not been randomly assigned to conditions. There are several types of nonequivalent groups designs we will consider. Posttest Only Nonequivalent Groups Design

What does NeGD mean for non-equivalent groups?

The design notation for the Non-Equivalent Groups Design (NEGD) shows that we have two groups, a program and comparison group, and that each is measured pre and post.

How are non-equivalent groups designs used in research?

If participants in this kind of design are randomly assigned to conditions, it becomes a true between-groups experiment rather than a quasi-experiment. In fact, it is the kind of experiment that Eysenck called for—and that has now been conducted many times—to demonstrate the effectiveness of psychotherapy.

What are the advantages of the non-equivalent control group?

Discussion: This paper provides an overview of the non-equivalent control group post-test-only design in terms of its design features, applications and statistical analysis, as well as its advantages and disadvantages.