How to describe voltage fluctuations 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 &quot;resting voltage&quot; is $-65mV$ - this can also be seen as the &quot;starting point&quot; of the random walk. I would now like to be able to measure the &quot;magnitude&quot; 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:
$$RMS= \sqrt{\frac{1}{n}\sum_{k=1}^n x_k^2}$$
Perhaps standard deviation is what you want. Standard deviation
$$\sigma= \sqrt{\frac{1}{n}\sum_{k=1}^n (x_k-x_{ave})^2}$$
(where $x_{ave}$ is the average of your sequence) quantifies the fluctuations of your sequence above and below the sequence's average value. The square of the standard deviation, $\sigma^2$, is the variance of your sequence which is a measure of the power of the fluctuations.