Hi all, I've been struggling along with this for a while, so your help would be greatly appreciated. Using an array of prices from a T-SQL database for a number of stocks I wish to calculate the volatility of returns for these stocks, which will then be multiplied by the weight of that stock in a portfolio of stocks. If anyone has written anything that would assist, I would appreciate it greatly. I am struggling particularly when the number of data points for a stock differ, e.g. if Stock X has n data points and stock Y has n-m data points. Many thanks! S [[alternative HTML version deleted]]