Swiss Economicblogs.org
Standard deviation (sigma σ) measures volatility or the dispersion of random values around the mean of a variable such as a portfolio or individual stock prices, but does not measure the direction of a trend. Standard Deviation as volatility measure What has become the bedrock of finance is an out-of-date almost universally accepted finance theory, which uses the statistical normal distribution (the Gaussian bell curve) as the measure of risk per se. In reality stocks are found not to be...
Read More »The Fallacies of Portfolio Volatility Measurements
