ALPHA: A measure of performance on a risk-adjusted basis. Alpha takes the volatility (price risk) of a fund and compares its risk-adjusted performance to a benchmark index. The excess return of the fund relative to the return of the benchmark index is a fund's alpha.

Simply stated, alpha is often considered to represent the value that a portfolio manager adds to or subtracts from a fund's return.

A positive alpha of 1.0 means the fund has outperformed its benchmark index by 1%. Correspondingly, a similar negative alpha would indicate an underperformance of 1%.

BETA: A measure of the volatility, or systematic risk, of a security or a portfolio in comparison to the market as a whole. The tendency of a security's returns to respond to swings in the market.

A beta of 1 indicates that the security's price will move with the market. A beta of less than 1 means that the security will be less volatile than the market. A beta of greater than 1 indicates that the security's price will be more volatile than the market. For example, if a stock's beta is 1.2, it's theoretically 20% more volatile than the market.

SHARPE RATIO: The Sharpe ratio tells us whether the returns of a portfolio are due to smart investment decisions or a result of excess risk. This measurement is very useful because although one portfolio or fund can reap higher returns than its peers, it is only a good investment if those higher returns do not come with too much additional risk. The greater a portfolio's Sharpe ratio, the better its risk-adjusted performance has been.

It is calculated by subtracting the risk-free rate from the rate of return for a portfolio and dividing the result by the standard deviation of the portfolio returns.

A variation of the Sharpe ratio is the Sortino ratio, which removes the effects of upward price movements on standard deviation to instead measure only return against downward price volatility