NXTM: NxStage Medical, Inc.

Annualized standard deviation measures the volatility of portfolio returns. It represents the consistency with which returns were delivered in the past.

     = low volatility (<25%)
     = medium volatility (between 25% and 45%)
     = high volatility (> 45%)

A measure of risk-adjusted return, using the return and standard deviation. A higher Sharpe Ratio indicates the portfolio has earned a higher return for each unit of risk incurred. The higher the better.