The "Positive Volume Index" indicator

It has no input parameters. It is calculated by the following formula:

if Volume[i]<=Volume[i+1]  Positive Volume Index[i]=Positive Volume Index[i+1]  and
  
if Volume[i]>Volume[i+1]    Positive Volume Index[i]=Positive Volume Index[i+1]*(1+(Close[i]-Close[i+1])/Close[i+1])