Nonparametric Tests -- One Sample Wilcoxon Signed Rank Test
 
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One Sample Wilcoxon Signed Rank Test

One-sample Wilcoxon signed rank test is a nonparametric alternative method of one-sample t-test, which is used to test whether the location (median) of the measurement is equal to a specified value.

Since it is a nonparametric test, it requires no assumption for the distribution of the measurement. So when normal assumption is not satisfied, it is a powerful alternative of one-sample t-test:

Customers can set the following features by OriginPro when he/she performs the one-sample Wilcoxon signed rank test:

  1. Specify the Test Mean
  2. Determine which alternative hypothesis is performed, upper lower or two-tailed:
    • Median<>Value: two-tailed one-sample Wilcoxon signed rank test will be performed
    • Median>Value: upper-tailed one-sample Wilcoxon signed rank test will be performed
    • Median<Value: lower-tailed one-sample Wilcoxon signed rank test will be performed

  One Sample Wilcoxon Signed Rank Test interface

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Further, you can set where to output your results and whether to output Results Log dialog.

An illustration of One Sample Wilcoxon Signed Rank Test results being displayed in Origin

In this example, a weight-loss researcher wants to determine if the mean weight loss is equal to or larger than 5 pounds in an experiment where 12 people were observed. The weight loss of these 12 people was stored as one single column. Since the normality of this measurement is not satisfied, one-sample Wilcoxon signed rank test should be required.

 

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