Single-case and Small-n Experimental Designs
A Practical Guide To Randomization Tests
Psychology Press – 2001 – 272 pages
This book is a practical guide to help researchers draw valid causal inferences from small-scale clinical intervention studies. It should be of interest to teachers of, and students in, courses with an experimental clinical component, as well as clinical researchers.
Inferential statistics used in the analysis of group data are frequently invalid for use with data from single-case experimental designs. Even non-parametric rank tests provide, at best, approximate solutions for only some single-case (and small-n ) designs. Randomization (Exact) tests, on the other hand, can provide valid statistical analyses for all designs that incorporate a random procedure for assigning treatments to subjects or observation periods, including single-case designs. These Randomization tests require large numbers of data rearrangements and have been seldom used, partly because desktop computers have only recently become powerful enough to complete the analyses in a reasonable time. Now that the necessary computational power is available, they continue to be under-used because they receive scant attention in standard statistical texts for behavioral researchers and because available programs for running the analyses are relatively inaccessible to researchers with limited statistical or computing interest.
This book is first and foremost a practical guide, although it also presents the theoretical basis for Randomization tests. Its most important aim is to make these tests accessible to researchers for a wide range of designs. It does this by providing programs on CD-ROM that allow users to run analyses of their data within a standard package (Minitab, Excel, or SPSS) with which they are already familiar. No statistical or computing expertise is required to use these programs. This is the "new stats" for single-case and small-n intervention studies, and anyone interested in this research approach will benefit.
"The presentation is good, and the authors give a practical resource for those who must work with the specific designs in the text."
Contents: Preface. Data Analysis in Single-Case and Small-n Experiments. Statistical and Visual Analysis. Approaches to Statistical Inference. Principles of Randomization Tests. Randomization Designs for Single-Case and Small-n Studies. Randomization Tests Using Minitab. Randomization Tests Using Excel. Randomization Tests Using SPSS. Other Sources of Randomization Tests. The Use of Randomization Tests With Nonrandomized Designs. The Power of Randomization Tests. Creating Your Own Randomization Tests.