Multiple Comparisons (Dunn, Dunn-Bonferroni, & Nemenyi Tests)

　

Exercise:
  The following data show the operation time of 3 hospitals for the same surgical procedure.

1) Analyze whether there are statistically significant differences among hospitals.
2) If there are significant differences among hospitals, find which hospitals have statistical differences in the operation time.

　　　　　Hospital A: 57, 45, 77, 55, 54
　　　　　Hospital B: 58, 42, 41, 50, 47 　
　　　　　Hospital C: 67, 67, 77, 92, 95 minutes

Comparative Verification Test

Kruskal-Wallis test: StatFinale, 0.0121; SPSS, 0.012; EZR, 0.0121.
Multiple comparisons: Exact match with SPSS
Multiple C (Dunn-Bonferroni test): StatFinale & SPSS
Pairwise Comparisons: EZR
Multiple C (Steel test, control vs others): StatFinale (using critical values), EZR (using p-values).

Reports of SPSS & EZR

※Click pics to enlarge.