GY-63_MS5611/libraries/RunningMedian

RunningMedian

Arduino library to determine the running median by means of a circular buffer.

Description

Running Median looks like a running average with a small but important twist. Running average averages the last N samples while the running median takes the last N samples, sort them and take the middle one, or the average of the middle two.

Important differences between running average and running median:

• Running median will return real data (e.g. a real sample from a sensor) if one uses an odd size of the buffer (preferred). Running average may return a value that is never sampled.
• Running median will give zero weight to outliers, and 100% to the middle sample, whereas running average gives the same weight to all samples.
• Running median will give often constant values for some time.
• As one knows the values in the buffer one can predict to some extend how much the next samples will change the running median.
• Running median is a bit harder as one needs to keep the values in order to remove the oldest and keep them sorted to be able to select the median.

Operation

See examples