Biomedical Statistics by Shakti Kumar Yadav & Sompal Singh & Ruchika Gupta

Author:Shakti Kumar Yadav & Sompal Singh & Ruchika Gupta
Language: eng
Format: epub
ISBN: 9789813292949
Publisher: Springer Singapore

11.9

17

8.1

7

12

18

8.2

8

12.4

19

8.5

10

12.6

20

9

11

Rank sum

153

57

Since the calculated z is less than −1.96, the difference between group A and B is statistically significant.

17.3 Wilcoxon Signed Rank Sum Test

It is a nonparametric alternative for one sample t-test or paired t-test . Here W statistics is calculated as follows.

Scenario 1

One sample test: for this we require a hypothesized median (or population median, M)

1.Calculate the difference of each observation from the hypothesized median.

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