Unanswered: How to Calculate Percentile Ranks within Database
Is someone familiar with the method by which one can calculate the Percentile Ranks for the IV Implied Volatility in a Stock Market Database ?
IV Percentile rank simply tells us whether implied volatility is high or low in a specific underlying based on the past year of IV data. For example, if XYZ has had an IV between 30 and 60 over the past year and IV is currently at 45, XYZ would have an IV rank of 50%.
My table has got the IV Value for each symbol for the past one year and I need to calculate the IV Percentile Rank for each symbol based on this past one year data.