First Order Difference :   
 
    0.19867    0.19075    0.17522    0.15271    0.12411    0.09057 
 Second Order Difference :   
 
  - 0.00792  - 0.01552  - 0.02251  - 0.02860  - 0.03355  
 Third Order Difference :   
 
  - 0.00760  - 0.00699  - 0.00609  - 0.00495 
 Fourth Order Difference :   
 
    0.00062    0.00090    0.00114  
 Fifth Order Difference :   
 
    0.00028    0.00024  

 Sixth Order Difference :   
 
  - 0.00004 
 Value of p2(0.67) :    
 
    0.62065 
 Value of p4(0.67) :    
 
    0.62098 
 
 Error in estimation :    
 
    0.00001