Selecting Outliers

The Select Outliers feature enables you to pick the fields that are considered as outliers. By default, there is only one outlier selector available, that is, MAD (median absolute deviation).

To select the outliers, click SELECTION > Select outliers > MAD (median absolute deviation).

The MAD plugin defines “outliers” as values that are significantly larger or smaller than the median. First it calculates the median and the standard deviation of all the data, then it uses these two values to pick a reasonable threshold. For example, if most values are in the range of 23 to 76 then it might pick a threshold of 0 and 100. If you choose Select Outliers -> MAD”, it will select any data that exceeds this threshold in any of the displayed columns.