ERIC Number: EJ509566
Record Type: CIJE
Publication Date: 1995
Reference Count: 0
When Is It Worth Measuring a Covariate in a Randomized Clinical Trial?
Allison, David B.
Journal of Consulting and Clinical Psychology, v63 n3 p339-43 Jun 1995
In a randomized clinical trial, a researcher can increase statistical power by including a covariate (or pretest) to reduce participants; however, this raises the cost per participant. A simple closed form expression is derived that applied researchers can use to answer the cost/benefit question. (JPS)
Publication Type: Reports - Research; Journal Articles
Education Level: N/A
Authoring Institution: N/A