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# Kaufman Efficiency Indicator

## [Kaufman Efficiency Indicator](/function/technical-analysis.md#kaufman-efficiency-indicator)

<mark style="color:red;">`er(`</mark>[<mark style="color:blue;">`candles`</mark>](/function/functions/candles.md)<mark style="color:red;">`: List[[`</mark>[<mark style="color:blue;">`Candle`</mark>](/function/structures.md#candle)<mark style="color:red;">`]], period: int = 14, column: str = "close") -> List[Decimal]`</mark>