Additional Tables for Steel-Dwass-Critchlow-Fligner Distribution-Free Multiple Comparisons of Three Treatments

摘要

Additional critical points are presented for the Steel—Dwass—Critchlow—Fiigner distribution-free multiple comparison procedure for comparing all pairs of three population medians in the one-way layout. A computational technique developed by van de Wiel is used to find critica' points yielding an experimentwise error rate of approximately 0.01, 0.05, and 0.10 for a total sample size of at most 30, with individual sample sizes from 4 to 10 and a maximum sample size of at least 8, and for equal sample sizes from 8 to 14. Additional discussion is given regarding step-down testing methods and the dangers of using the Steel-Dwass-Critchlow-Fligner procedure with unequal sample sizes if two of the sample sizes are very small.