When collecting live data, we often encounter the problem of a high variance within the data. The problem with live data is that we might not be able to store a history of the data. As an example, we might only store the 2 latest measures and update the average value every time.
To avoid a zig-zag curve we can use a weighted (smooth) average with parameter alpha, also called Moving Average.
In our case we are storing estimatedValue and measuredValue, and we are updateing estimatedValue in the following matter:
estimatedValue <- alpha * measuredValue + (1 - alpha) * estimatedValue
This updateing smooths the curve nicely, e.g. for alpha=0.2: