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Steps required in performing the sign test |
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| Step |
Details |
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| 1 |
State the null hypothesis and, in particular, the hypothesized value for comparison |
| 2 |
Allocate a sign (+ or -) to each observation according to whether it is greater or less than the hypothesized value. (Observations exactly equal to the hypothesized value are dropped from the analysis) |
| 3 |
Determine: |
| N+ = the number of observations greater than the hypothesized value |
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| N- = the number of observations less than the hypothesized value |
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| S = the smaller of N+ and N- |
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| 4 |
Calculate an appropriate P value |
Whitley and Ball Critical Care 2002 6:509 doi:10.1186/cc1820 |
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