Sentimental RSI helps shorter term discretionary Traders to prepare for their trading decision. It doesn’t gives buy or sell signals but guides you to focus on right side of the trade most of the time especially when you holding period is for 2-3 days.
“Autocorrelation, also known as serial correlation, is the cross-correlation of a signal with itself. Informally, it is the similarity between observations as a function of the time lag between them” – Wikipedia. Autocorrelation value ranges between +1 to -1. Where autocorrelation above zero indicates positive correlation and negative value indicates negative correlation.