I use this as a short term over bot over sold indicator for all my options trades. Reprinted here with permission.
If the market is oversold than I would tend to look at neutral to bullish plays, if the market is over bot then I would tend to look at neutral to bearish plays. Or to put it another way....say It's 2 or 3 weeks from expiration and I'm looking to put on some credit spreads. The TRIN is a very short term indicator, if it's showing that the market is overbot then I'd be looking at some credit call spreads and a UL that also looks to be overbot. If I'm looking at some potential plays in covered calls... I tend to do it when the market is oversold.