Documentation

Calculate the moving average

This page documents an earlier version of InfluxDB. InfluxDB v1.8 is the latest stable version. View this page in the v1.8 documentation.

See the equivalent InfluxDB v2.0 documentation: Calculate the moving average.

Use the movingAverage() or timedMovingAverage() functions to return the moving average of data.

data
  |> movingAverage(n: 5)

// OR

data
  |> timedMovingAverage(every: 5m, period: 10m)

movingAverage()

For each row in a table, movingAverage() returns the average of the current value and previous values where n is the total number of values used to calculate the average.

If n = 3:

Row #Calculation
1Insufficient number of rows
2Insufficient number of rows
3(Row1 + Row2 + Row3) / 3
4(Row2 + Row3 + Row4) / 3
5(Row3 + Row4 + Row5) / 3

Given the following input:

_time_value
2020-01-01T00:01:00Z1.0
2020-01-01T00:02:00Z1.2
2020-01-01T00:03:00Z1.8
2020-01-01T00:04:00Z0.9
2020-01-01T00:05:00Z1.4
2020-01-01T00:06:00Z2.0

The following would return:

|> movingAverage(n: 3)
_time_value
2020-01-01T00:03:00Z1.33
2020-01-01T00:04:00Z1.30
2020-01-01T00:05:00Z1.36
2020-01-01T00:06:00Z1.43

timedMovingAverage()

For each row in a table, timedMovingAverage() returns the average of the current value and all row values in the previous period (duration). It returns moving averages at a frequency defined by the every parameter.

Each color in the diagram below represents a period of time used to calculate an average and the time a point representing the average is returned. If every = 30m and period = 1h:

0:000:301:001:302:002:303:003:002:302:001:301:000:30

Given the following input:

_time_value
2020-01-01T00:01:00Z1.0
2020-01-01T00:02:00Z1.2
2020-01-01T00:03:00Z1.8
2020-01-01T00:04:00Z0.9
2020-01-01T00:05:00Z1.4
2020-01-01T00:06:00Z2.0

The following would return:

|> timedMovingAverage(
  every: 2m,
  period: 4m
)
_time_value
2020-01-01T00:02:00Z1.000
2020-01-01T00:04:00Z1.333
2020-01-01T00:06:00Z1.325
2020-01-01T00:06:00Z1.150

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