If you are trying to measure the price swings over a given period of time, first you must decide which product you want to figure and second you must figure a time frame. This process is also known as calculating historical volatility. Once you have your product and time frame, next you will measure the prices changes from day to day. Next, you must calculate the day to day average changes.
. Next you will find the difference and express it in a percentage. You can make your own spreadsheets or download spreadsheets at http://www.optiontradingtips.com/options101/volatility.html
