A market breadth indicator based on the relationship between the advance/decline spread and the volume of those stocks. It is calculated by dividing the advance/decline ratio by the upside/downside ratio. TRIN is an acronym for trading index and is also known as the Arms Index, named for its developer, Richard W. Arms, Jr.
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Margen de Avance/Declive
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Narrow-based index (NBI)
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