Market Meanness Index

[jayMcBee]

"The Market Meanness Index tells whether the market is currently moving in or out of a “trending” regime"

It measures serial correlation of price data:
The more trending the market becomes (little price change), the more the MMI decreases

Details:
https://financial-hacker.com/the-market-meanness-index/

[gcaplan]

+1 for this request. The author is a seasoned quant and is claiming excellent results. It's one of the more interesting of recent innovations and is based on a sound and simple statistical principle. It's also only relatively trivial to code.