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Definition

John Welles Wilder was an American engineer who invented the relative strength index (RSI) and various other technical indicators. The RSI is a momentum indicator which shows the acceleration or decelleration of a specific share, index or other data stream. The RSI is now a commonly used indicator in most charting packages to show the rate at which a data stream such as a share's price is changing. Momentum indicators like the RSI have the benefit that they signal the top of a trend before it occurs because they measure the slowing down of the upward momentum.

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