What is the problem with doing multiple pairwise comparisons to follow-up a significant Kruskal-Wallis test?
A)It decreases the significance of the Kruskal-Wallis test
B)None of these.
C)It inflates the familywise error rate.
D)It potentially masks important differences between variables.

Question

Quizplus · Accepted Answer

When conducting multiple pairwise comparisons following a significant Kruskal-Wallis test, the familywise error rate (FWER) is inflated, meaning there is a higher chance of making a Type I error (rejecting the null hypothesis when it is true). This can lead to false positive results and a lower confidence in the overall findings. It is recommended to use post-hoc tests with appropriate adjustments for multiple comparisons, such as the Bonferroni correction or Holm-Bonferroni method, to control the FWER.

What Is the Problem with Doing Multiple Pairwise Comparisons to Follow-Up