July 3, 2011 Post by Parker Binion

As a new feature on the Forum, I have added Volume-Weighted TRIN to the Pages menu on the right-hand side of the Forum.

The TRIN (Short-Term TRading INdex) or Arms Index (discovered by Richard Arms in 1967) is the ratio of advancing to declining issues divided by the ratio of advancing to declining volume.  As a breadth oscillator, it can be used as an overbought-oversold indicator.

The 5-day average TRIN is a popular way to smooth the indicator.   You simply add the final daily TRIN for each of the last 5 days and divide by 5.  Accordingly, each day counts the same in the 5-day simple TRIN average.

Some people prefer to use a 5-day exponential moving average of TRIN, which weighs the TRIN days in order of recency.

However, neither method accounts for volume.  I will update the Volume-Weighted TRIN chart on a weekly basis, and will update the TRIN data daily.

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