User Guide
Dixon test
To use the Dixon test the ratio is calculated:
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b = total range of measurements (here 14.1)
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a= the distance between the part suspected of having an abnormal value and its nearest neighbour (here 8.6)
The ratio is calculated in %:
We then compare this ratio with the Dixon table:
| Number of parts | 3 | 5 | 10 | 16 | 20 | 30 |
| Maximum ratio | 0.94 | 0.72 | 0.46 | 0.38 | 0.34 | 0.30 |
If the value is less than the maximum proposed ratio in the table then the value is not abnormal. Here a ratio of 62% per 5 parts is less than 72%. The point is thus not an abnormal value.