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Wilders Volatility Index

Wilders Volatility Index measures true range over time. Sometimes it is similar to Average True Range. But there are some differencies between:

1. This period's High and Low.
2. The previous period's Close and this period's High.
3. The previous period's Close and this period's Low.

The discussions on Volatility (Chaikin's), Option Volatility, and Standard Deviation explain the interpretation of other volatility indicators.