Noise calculation using the Root Mean Square (RMS)

The linear regression is calculated using all the data points within the time range of the current signal.

The noise is given by the formula:

RMS = S

where
RMS	Noise based on standard deviation method
S	Standard Deviation

Standard deviation of the linear regression of all data points in the selected time range, with linear function y(X)= a + bX:

where
a	Y Intercept
b	slope
N	Number of discrete observations
X_i	Independent variable, ith observation