I started following the correlation of XLY(SPDR Consumer Discretionary Select Sector Fund)/ XLP(SPDR Consumer Staples Select Sector SPDR Fund) to identify when the stock market (SPY & RUT) could be changing the trend direction.
Notice how XLY/XLP called the trend change in SPY and RUT back in July 2007. Notice how XLY/XLP called the trend change in SPY and RUT back in March 2009. Notice how XLY/XLP called the trend change in SPY and RUT back in December 2019.