Merge pull request #402 from influxdata/flux/kaufman-functions

Flux Kaufman functions

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/kaufmansama.md

@@ -0,0 +1,52 @@
+---
+title: kaufmansAMA() function
+description: >
+  The `kaufmansAMA()` function calculates the Kaufman's Adaptive Moving Average (KAMA)
+  using values in an input table.
+menu:
+  v2_0_ref:
+    name: kaufmansAMA
+    parent: built-in-aggregates
+weight: 501
+related:
+  - /v2.0/reference/flux/functions/built-in/transformations/aggregates/kaufmanser/
+  - https://docs.influxdata.com/influxdb/v1.7/query_language/functions/#kaufmans-adaptive-moving-average, InfluxQL KAUFMANS_ADAPTIVE_MOVING_AVERAGE()
+---
+
+The `kaufmansAMA()` function calculates the Kaufman's Adaptive Moving Average (KAMA)
+using values in an input table.
+
+_**Function type:** Aggregate_
+
+```js
+kaufmansAMA(
+  n: 10,
+  columns: ["_value"]
+)
+```
+
+Kaufman's Adaptive Moving Average is a trend-following indicator designed to account
+for market noise or volatility.
+
+## Parameters
+
+### n
+The period or number of points to use in the calculation.
+
+_**Data type: Integer**_
+
+### column
+The column to operate on.
+Defaults to `"_value"`.
+
+_**Data type: String**_
+
+## Examples
+```js
+from(bucket: "telegraf/autogen"):
+  |> range(start: -7d)
+  |> kaufmansAMA(
+    n: 10,
+    column: "_value"
+  )
+```

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/kaufmanser.md

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+---
+title: kaufmansER() function
+description: >
+  The `kaufmansER()` function calculates the Kaufman's Efficiency Ratio (KER) using
+  values in an input table.
+menu:
+  v2_0_ref:
+    name: kaufmansER
+    parent: built-in-aggregates
+weight: 501
+related:
+  - /v2.0/reference/flux/functions/built-in/transformations/aggregates/kaufmansama/
+  - https://docs.influxdata.com/influxdb/v1.7/query_language/functions/#kaufmans-efficiency-ratio, InfluxQL KAUFMANS_EFFICIENCY_RATIO()
+---
+
+The `kaufmansER()` function calculates the Kaufman's Efficiency Ratio (KER) using
+values in an input table.
+The function operates on the `_value` column.
+
+_**Function type:** Aggregate_
+
+```js
+kaufmansER(n: 10)
+```
+
+Kaufman's Efficiency Ratio indicator divides the absolute value of the
+Chande Momentum Oscillator by 100 to return a value between 0 and 1.
+Higher values represent a more efficient or trending market.
+
+## Parameters
+
+### n
+The period or number of points to use in the calculation.
+
+_**Data type: Integer**_
+
+## Examples
+```js
+from(bucket: "example-bucket")
+  |> range(start: -7d)
+  |> kaufmansER(n: 10)
+```