Pairwise comparisons of dependent groups based on medians

For J >= 2 dependent groups, let theta(j) be the 0.5 quantile associated with the marginal distribution of the jth group. The paper focuses on two methods for testing H-0: theta(j) = theta(k) for all j < k. The first uses an estimate of the standard error of the estimated difference, with the estimates of the 0.5 quantiles based on a single order statistic. In simulations it is found to perform well with a sample size greater than or equal to 30. The second method uses the usual sample median in conjunction with a so-called bias adjusted percentile bootstrap method and performs well in simulations with sample sizes as small as 11. (C) 2005 Elsevier B.V. All rights reserved.