NYSE TRIN
The TRIN, or Arms index, is considered a reliable indicator of the daily direction of the market.
The calculation relates up-volume and up-issues to down-volume and down-issues for the overall market.
TRIN is the ratio of advances to declines divided by the ratio of up-volume to down-volume and is calculated using the following formula:
TRIN = (# of advancing stocks / # of declining stocks) / (up-volume/down-volume)
For example, if the number of advances equals the number of declines and the total up-volume equals the total down-volume, the ratio is 1.0 over 1.0, for a TRIN ratio of 1.0.
If the TRIN is greater than 1.0 this is considered bearish, conversely a ratio less than 1.0 is considered bullish.
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