if B1 > 0 and B2 >0 Increasing if B1 >0 and B2<0 Inverted U Shape if B1<0 and B2<0 Decreasing if B1 < 0 and B2 > 0 U shape Data I pro grammatically find the value of NIFTY that changes B1 and B2 to change the shape. The degree of polynomial needs to change to 5 or 6 for accuracy , Historical validation ,customized volatility and standard deviation , Fibonacci ratios are things i use on top of this.