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Would you expect the volatility of a share index to be greater than or less than the volatility of a typical share?
The same - because that is how "typical" would be defined.
What is the historical volatility of a stock?
The historical volatility of a stock is the variation of the returns over a period of time (say, over the last twelve months). The variation of the returns is usually taken as the standard deviation of the returns. You need a spreadsheet to calculate historical volatility (see the related link for an example)
Why is beta the correct measure of a stock riskiness?
Beta measures a stock's volatility (the swings up and down in price). The market as a whole has a beta of 1.0, but each stock is determined a beta value from a history of it's stock movements. Riskiness equates to the stock losing value and high beta stocks are more prone to falling faster.
How do you calculate beta in mutual funds?
Check out these websites: http://faculty.babson.edu/academic/Beta/CalculateBeta.htm http://www.money-zine.com/Investing/Stocks/Stock-Beta-and-Volatility/
How is beta determined for a stock?
You'll need a spreadsheet like Excel. Do the following. 1) Get percentage daily returns for the stock between two dates (I suggest every day for a year). You can get this historical data from Yahoo Finance 2) Pick a benchmark index 3) Get percentage daily returns for the index between the two dates as well 4) Calculate the covariance of the stock with respect to the index and divide by the variance of the stock [the two excel functions you'll need are covariance.p() and variance.p() ] Go to the related link below for a spreadsheet to do this.
