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A comparison of size and power calculations for the wilcoxon statistic for ordered categorical data
Author(s) -
Kolassa John E.
Publication year - 1995
Publication title -
statistics in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.996
H-Index - 183
eISSN - 1097-0258
pISSN - 0277-6715
DOI - 10.1002/sim.4780141408
Subject(s) - categorical variable , statistic , statistics , wilcoxon signed rank test , mathematics , econometrics , power (physics) , test statistic , cornish , statistical hypothesis testing , mann–whitney u test , physics , linguistics , philosophy , quantum mechanics
This paper compares the accuracy of approximations to test size and power based on the score and the Fisher information, with calculations using Edgeworth and Cornish—Fisher approximations, and demonstrates that in some cases one must exercise much care in using the simpler approximations.