URI: http://www.qualityml.org/1.0/domain/DifferentialErrorsXThreshold
Name: 1D Differential Error Measure with a threshold X
Alternative names:  
Definition:

Given a measured xmi coordinate and a xti considered to represent the truth, the differential error for one dimensional positional values with a threshold is calculated as:

X_DifferentialErrorMeasures.jpg

selecting values:
if level="above": |exi|>emax
if level="below": |exi|<emax

Source: ISO 19157