PCR ratio
  PCR - The PCR is Put call Ratio i.e  The  ratio  of  put   trading volume divided by the  call  trading volume. If the put call ratio is 0.90 it mean that for every 100 call bought, 90 put were bought.  FORMULA   PCR  =    TOTAL PUTS OI / TOTAL CALLS OI    Lets makes if simple buy the following example       If the total call open interest is  8,067,600  and the put open interest is   5,257,650  show in the pic which is given from the nseindia official website         lets divide the put open interest buy call open interest.     PCR =  5257650/   8067600             = 0.65                                                                                                 ...