The Rate of Change
measures how fast the market is moving in a particular direction over a period of time. The 52-week ROC
is often used to monitor long term trends. The 52-week ROC
crossed the zero line twice since 2007. Dec 2007 (end of the bull run started in 2003) and Oct 2009 the beginning of the new bull market. The bull market could be close to an end. Another cross of the ROC
0 line would be the confirmation.