In this video from Ciovacco Capital they take a look at historical data of the following:
-Percentage of S&P 500 stocks above their 200 day moving average-RYDEX bull/bear ratio from 1999 - 2020
-Percentage of Nasdaq stocks above their 200 day moving average
-Nasdaq 100 stocks above 150 day simple moving average
-NYSE stocks greater than their 150 day moving average
-NYSE breadth indicator looking at oversold conditions to over bought in a short time period
-NYSE advance decline line
-Trend streak models, moving averages
-Bonds vs Stocks
-A look at the weekly volatility index