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 bullish, conversely a ratio less than 1.0 is considered bearish.

Barchart.com calculates the TRIN value inside our realtime ticker plant once a minute. The ticker symbol for the NYSE TRIN is X2Y0.