Rate of Change (ROC) indicator is the foundation of Know Sure Thing (KST) indicator. Know sure thing (KST) indicator is useful to identify major stock market cycle junctures because it formula is weighed to have larger influence by the longer and more dominant time span to better reflecting the primary swings of stock market cycle.
X1 = 10
X2 = 15
X3 = 20
X4 = 30
W1 = 1
W2 = 2
W3 = 3
W4 = 4
AVG1 = 10
AVG2 = 10
AVG3 = 10
AVG4 = 15
ROC1 = (1-Close/Close[X1])*100
ROC2 = (1-Close/Close[X2])*100
ROC3 = (1-Close/Close[X3])*100
ROC4 = (1-Close/Close[X4])*100
KST = ( Average[AVG1](ROC1) * W1 ) + ( Average[AVG2](ROC2) * W2 ) + ( Average[AVG3](ROC3) * W3 ) + ( Average[AVG4](ROC4) * W4 )
RETURN KST