
http://stockcharts.com/c-sc/sc?s=$NYA&p=D&yr=0&mn=9&dy=0&i=p58907769646&a=161769952&r=599.png
http://stockcharts.com/c-sc/sc?s=$SPX&p=D&yr=0&mn=9&dy=0&i=p58907769646&a=161769885&r=216.png
http://stockcharts.com/c-sc/sc?s=$COMPQ&p=D&yr=0&mn=9&dy=0&i=p58907769646&a=161770516&r=11.png
http://stockcharts.com/c-sc/sc?s=$NDX&p=D&yr=0&mn=9&dy=0&i=p58907769646&a=252974956&r=369.png
SCH = 25 day ROC (rate of change) of SPX (or any index) smoothed by 5, 8, or 13ema. For very long term 55, 89, 144ema
There are many ways to use it, 8 & 13 crossover, crossover of 50-day ma & or 200-day ma, etc.
25-day ROC is half of the 50-day & 1/4 of the 200-day (please do not ask what SCH means)
mss