To use the Dixon test the ratio is calculated:
b = total range of measurements (here 14.1)
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|
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.