Standard deviation

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Standard deviation is a statistical measurement that sheds light on historical volatility. For example, a volatile stock will have a high standard deviation while the deviation of a stable blue chip stock will be lower. A large dispersion tells us how much the return on the fund is deviating from the expected normal returns.
 * 1) A measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation. Standard deviation is calculated as the square root of variance.
 * 2) In finance, standard deviation is applied to the annual rate of return of an investment to measure the investment's volatility. Standard deviation is also known as historical volatility and is used by investors as a gauge for the amount of expected volatility.

Bond Index Funds

 * Vanguard Short Term Bond Index
 * Vanguard Intermediate Term Bond Index
 * Vanguard Total Bond Market Index
 * Vanguard Long Term Bond Index
 * Comparative Statistics

US Government Bond Funds

 * Vanguard Short Term Treasury Fund
 * Vanguard Intermediate Term Treasury Fund
 * Vanguard Long Term Treasury Fund
 * Vanguard Inflation Protected Securities Fund
 * Vanguard GNMA Fund
 * Comparative Statistics

Corporate Bond Funds

 * Vanguard Short Term Investment Grade Bond Fund
 * Vanguard Intermediate Term Investment Grade Bond Fund
 * Vanguard Long Term Investment Grade Bond Fund
 * Vanguard High Yield Corporate Bond Fund
 * Comparative Statistics

Tax Exempt Bond Funds

 * Vanguard Short Term Tax Exempt Bond Fund
 * Vanguard Limited Term Tax Exempt Bond Fund
 * Vanguard Intermediate Term Tax Exempt Bond Fund
 * Vanguard Long Term Tax Exempt Bond Fund
 * Comparative Statistics

Balanced Funds

 * Vanguard Balanced Index Fund
 * Vanguard Tax-Managed Balanced Fund
 * Vanguard Asset Allocation Fund
 * Vanguard LifeStrategy Growth Fund
 * Vanguard LifeStrategy Moderate Growth Fund
 * Vanguard LifeStrategy Conservative Growth Fund
 * Vanguard LifeStrategy Income Fund
 * Comparative Statistics

Vanguard Equity Index Funds

 * Vanguard Total Stock Market Index
 * Vanguard 500 Index Fund
 * Vanguard Growth Index Fund
 * Vanguard Value Index Fund
 * Vanguard Extended Market Index Fund
 * Vanguard Mid Cap Index Fund
 * Vanguard Small Cap Index Fund
 * Vanguard Small Cap Growth Index Fund
 * Vanguard Small Cap Value Index Fund
 * Comparative Statistics

Vanguard Tax-Managed Equity Funds

 * Vanguard Tax-Managed Capital Appreciation Fund
 * Vanguard Tax-Managed Growth & Income Fund
 * Vanguard Tax-Managed Small Cap Fund
 * Vanguard Tax-Managed International Fund
 * Comparative Statistics

Vanguard Specialized and Sector Funds

 * Vanguard REIT Index Fund
 * Vanguard Market Neutral Fund