Permutation-Based Tests of Perfect Ranking
  We improve three tests of perfect ranking in ranked set sampling proposed by Li and Balakrishnan (2008) using a permutation approach. This simple way of extending all three concepts to comparisons across different cycles increases the power. Two of the proposed tests are equivalent to tests from the literature, which were derived differently and are therefore generalized by the permutation-based tests. 
Ehsan Zamanzade, Nasser Reza Arghami and Michael Vock
stat.ME