"Generalized single-case randomization tests: Flexible analyses for a variety of situations": Erratum.

Reports an error in "Generalized single-case randomization tests: Flexible analyses for a variety of situations" by Joel R. Levin and Bruce E. Wampold (School Psychology Quarterly, 1999[Spr], Vol 14[1], 59-93). (1) In Table 5 (p. 76), in the cell associated with the third row and third column, the upper value of 18.3 should be 18.73. (2) On p. 81, in the section titled "Simultaneous Start-Point Randomization for Matched Pairs of Units," the sentence beginning in line 10 should read: "With k? acceptable start points for the first pair and k? for the second, there would be k?k? summed sums and null hypothesis-compatible summed differences for the randomization distribution to test Rgen and Rcomp, respectively (as indicated in the Appendix, p. 89)." (The following abstract of the original article appeared in record 1999-10944-004.) A general class of single-case statistical procedures, derived from previously developed nonparametric randomization tests, is presented. These procedures are widely applicable in behavioral and educational research contexts in which only a few experimental "units" (individuals, small groups, or classrooms) are the recipients of one or more experimental treatments or interventions. Specifically illustrated are designs that focus on both the general and comparative effectiveness of alternative interventions (including control/placebo treatments), multiple units with differentiable characteristics (i.e., intervention by unit characteristic interactions), and multiple outcome measures (i.e., intervention by outcome measure interactions). Also provided are operational modifications that enhance the internal validity of studies incorporating single-case randomization-based analyses. Appropriate cautions and issues surrounding the use of these procedures are included. (PsycINFO Database Record (c) 2010 APA, all rights reserved)