Which non-parametric test for ordinal data is the best to use in the given scenario? In a study by Zuckerman and Heneghan, hemodynamic stresses were measured on subjects undergoing laparoscopic cholecystectomy. An outcome variable of interest was the ventricular end-diastolic volume (LVEDV) measured in mm. A portion of the data appears in the following table. Baseline refers to a measurement taken 5 minutes after induction of anesthesia, and the term '5 minutes' refers to a measurement taken 5 minutes after baseline. Can we conclude that, on the basis of these data, among subjects undergoing laparoscopic cholecystectomy, the average LVEDV levels change? Let a =.01.

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Which non-parametric test for ordinal data is the best to use in the given scenario?

In a study by Zuckerman and Heneghan, hemodynamic stresses were measured on subjects undergoing laparoscopic cholecystectomy. An outcome variable of interest was the ventricular end-diastolic volume (LVEDV) measured in mm. A portion of the data appears in the following table. Baseline refers to a measurement taken 5 minutes after induction of anesthesia, and the term '5 minutes' refers to a measurement taken 5 minutes after baseline. Can we conclude that, on the basis of these data, among subjects undergoing laparoscopic cholecystectomy, the average LVEDV levels change? Let a =.01.

LVEDV (ml)
Subject Baseline 5 minutes
1 51.7 49.3
2 79.0 72.0
3 78.7 67.0
4 80.3 70.4
5 72.0 65.9
6 85.0 84.8
7 79.0 77.7
8 71.3 74.0
9 54.3 58.0
10 58.8 65.0

a. Mood Median Test

b. Sign Test

c. Wilcoxon Rank Sum Test

d. Wilcoxon Matched-Pair Signed-Ranks Test

e. Spearman and Kendall Correlation Coefficients

f. Kruskal-Wallis Test

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