The Correlation Angle Indicator was created by John Ehlers
(Stocks & Commodities
V. 38:06 (8–15)) and this is technically three indicators in one so I'm splitting each one to a separate script. This particular indicator was designed for trend termination and simply buy when it is green and sell when it turns red.
Let me know if you would like to see me publish other scripts or if you want something custom done!