# Pretest-Posttest Experiment

A Pretest-Posttest Experiment is an designed experiment with a Pretest Measure and a Posttest Measure.

**Context:**- It can range from being a One-Group Pretest-Posttest Experiment to being a Comparative Pretest-Posttest Experiment.
- It can range from being a Nonrandomized Control Group Pretest-Posttest Experiment to being a Randomized Control Group Pretest-Posttest Experiment.

**See:**Posttest-Only Experiment.

## References

### 2003

- (Dimitrov & Rumrill, 2003) ⇒ Dimiter M. Dimitrov, and Phillip D. Jr Rumrill. (2003). “Pretest-posttest Designs and Measurement of Change.” In: WORK: A Journal of Prevention, Assessment and Rehabilitation, 20(2).
- QUOTE: … Notations used in this section are [math]Y_1[/math] = pretest scores, [math]T[/math] = experimental treatment, [math]Y_1[/math] = posttest scores, [math]D = Y_2 - Y_1[/math] (gain scores), and RD = randomized design (random selection and assignment of participants to groups and, then, random assignment of groups to treatments). With the RDs discussed in this section, one can compare experimental and control groups on (a) posttest scores, while controlling for pretest differences or (b) mean gain scores, that is, the difference between the posttest mean and the pretest mean. Appropriate statistical methods for such comparisons and related measurement issues are discussed later in this article. ...

### 1995

- (Dugard & Todman, 1995) ⇒ Pat Dugard, and John Todman. "Analysis of pre‐test‐post‐test control group designs in educational research.” In: Educational Psychology 15, no. 2 (1995): 181-198.