Drift and Wander
Drift and wander are calculated if Signal to noise is selected in the processing method. They are calculated regardless of which noise calculation type you select.
Drift
Drift is given as the slope of the linear regression. The drift is first calculated by determining the linear regression using all the data points in the time range. The linear regression line is subtracted from all data points within the time range to give the drift-corrected signal.
Drift for noise as Six Times the Standard Deviation
Curve Formula:
y(X) = a + bX
where | |
N |
Number of discrete observations |
Xi |
Independent variable, ith observation |
Yi |
Dependent variable, ith observation |
Coefficients:
Wander
Wander is determined as the peak-to-peak noise of the mid-data values in the ASTM noise cycles, see Noise Calculation Using Six Times the Standard Deviation.
Wander of noise as determined by the ASTM Method