How can I track the 40-day historical vol. on a stock?

Discussion in 'Options' started by traderanonymous, May 4, 2005.

  1. very quick question....

    ln(today's close/yesterday's close) equals something marginally different than (today's close/yesterday's close - 1) in excel.

    Does anyone know which is more accurate?


    The New Guy
    #11     Jul 26, 2005