10/22/2008

Ordered Alternatives

• Jonckheere-Terpstra Test Procedure
  • Calculate the Mann-Whitney counts for all possible pairs of treatments.
  • Jonckheere-Terpstra Statistic (J)
  • Jonckheere-Terpstra Test
    • Enter Table A.13 with increasing sample sizes to find the critical value.
  • If k=2, the Jonckheere-Terpstra test is equivalent to the one-sided Mann-Whitney-Wilcoxon two-sample test.
  • L.S.A.
  • Dealing with ties
    • Use a permutation test to get an exact p-value.
• Exercise 19 on p. 211