Simply put, multiple trends that typically correlate in the same direction and this typically works. Example, FANG stocks typically trend together. Multiply these trends and evaluate the trend to truly see the trend.
Trading the SPY, looking for a short set-up, I use the VI as one of a few tools. VI starts jamming up and I think that's a nice indication of a short opportunity. Get in short and trades going bad, but VI is jamming up. switch chart that VI indicator is on to 5m and then back to 10m, and now its a different image, VI going down and has been for a few minutes.
I'm hoping I can get some insight to save me time, but it appears that the indicator does continuous summing as day goes goes on and a refresh seems to clean it up. Seems to need time to build up.
I have screen shots and video of issue should anyone be interested.