I am looking for a way to describe the properties of voltage fluctuations - is the RMS amplitude a suitable measure? Attached is a screenshot showing the random current fluctuations (in the case of strong noise this corresponds to a random walk)
EDIT:This random walk is the voltage fluctuations in a programmed neuron model. The "resting voltage" is $-65mV$ - this can also be seen as the "starting point" of the random walk. I would now like to be able to measure the "magnitude" of the fluctuations. The data vector looks like this $v[i] = (-65,-65.12,-64.63.....$) for i=1000 time steps, for example. But if I calculate the RMS value, I get a value that is more or less the same size as the average (i.e. 64.3mV), which is nonsensical... I may also be measuring it wrong, but according to Wiki:
$$RMS= \sqrt{\frac{1}{n}\sum_{k=1}^n x_k^2}$$