A method for quantifying an operating condition on a valve assembly, the method comprising: receiving an input with a sample set of data having data samples that correspond with operating parameters for the valve assembly, the operating parameters comprising a position and a setpoint; determining a first amplitude, the first amplitude having a value that quantifies a change in the position from a first position to a second position; comparing the first amplitude to a second amplitude, the second amplitude having a value that quantifies a change in the setpoint from a first setpoint to a second setpoint; and generating an output that reflects a relative position of the first amplitude with respect to the second amplitude; determining a stick-slip condition metric; and comparing the stick-slip condition metric to a threshold criteria, wherein the threshold criteria has a value that corresponds with stick-slip on the valve assembly, and wherein the value for the first amplitude indicates that the stick-slip condition metric exceeds the value for the threshold criteria; characterized in that the stick-slip condition metric is calculated in accordance with, M ST = M P M S wherein M ST is the stick-slip condition metric, Mp is a position metric, and M S is a setpoint metric, wherein the position metric Mp and the setpoint metric M S are calculated in accordance with, M P = ∑ P i − P i − 1 X N X M S = ∑ S i − S i − 1 X N X and wherein Pi-i is a first data sample for the position, Pi is a second data sample for the position that is adjacent the first data sample in the sample set, S i-1 is a first data sample for the setpoint, Si is a second data sample for the setpoint that is adjacent the first data sample in the sample set, N is a number of data samples in the sample set, and X is a p-norm parameter. receiving an input with a sample set of data having data samples that correspond with operating parameters for the valve assembly, the operating parameters comprising a position and a setpoint; determining a first amplitude, the first amplitude having a value that quantifies a change in the position from a first position to a second position; comparing the first amplitude to a second amplitude, the second amplitude having a value that quantifies a change in the setpoint from a first setpoint to a second setpoint; and generating an output that reflects a relative position of the first amplitude with respect to the second amplitude; determining a stick-slip condition metric; and comparing the stick-slip condition metric to a threshold criteria, wherein the threshold criteria has a value that corresponds with stick-slip on the valve assembly, and wherein the value for the first amplitude indicates that the stick-slip condition metric exceeds the value for the threshold criteria; characterized in that the stick-slip condition metric is calculated in accordance with, M ST = M P M S wherein M ST is the stick-slip condition metric, Mp is a position metric, and M S is a setpoint metric, wherein the position metric Mp and the setpoint metric M S are calculated in accordance with, M P = ∑ P i − P i − 1 X N X M S = ∑ S i − S i − 1 X N X and wherein Pi-i is a first data sample for the position, Pi is a second data sample for the position that is adjacent the first data sample in the sample set, S i-1 is a first data sample for the setpoint, Si is a second data sample for the setpoint that is adjacent the first data sample in the sample set, N is a number of data samples in the sample set, and X is a p-norm parameter.