# Metric Overlays

Metric overlays help smooth metric values or to identify extreme values, over a given lookback period.

### Metric Simple Moving Average

Add an **n-period** simple moving average to the metric pane.

To filter and backtest the simple moving average of the metric change the **Backtest Settings** from **Metric** to **SMA Metric**.

### Metric Exponential Moving Average

Add an **n-period** exponential moving average to the metric pane.

To filter and backtest the exponential moving average of the metric change the **Backtest Settings** from **Metric** to **EMA Metric**.

### Metric Bollinger Bands (Test Upper)

Add **n-period** Bollinger Bands to the metric pane.

This transformation will calculate the percentage distance that the metric itself is from the Upper Bollinger Band. A value above 0 indicates the metric is above the Upper Bollinger Band, and a value below 0 indicates the metric is below the Upper Bollinger Band.

To filter and backtest the Bollinger Band of the metric change the **Backtest Settings** from **Metric** to **Distance from Upper Bollinger**.

### Metric Bollinger Bands (Test Lower)

Add **n-period** Bollinger Bands to the metric pane.

This transformation will calculate the percentage distance that the metric itself is from the Lower Bollinger Band. A value above 0 indicates the metric is above the Lower Bollinger Band, and a value below 0 indicates the metric is below the Lower Bollinger Band.

To filter and backtest the Bollinger Band of the metric change the **Backtest Settings** from **Metric** to **Distance from Lower Bollinger**.

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