Portfolio Variance

Dictionary Says

Definition of 'Portfolio Variance'


The measurement of how the actual returns of a group of securities making up a portfolio fluctuate. Portfolio variance looks at the standard deviation of each security in the portfolio as well as how those individual securities correlate with the others in the portfolio. In other words, portfolio variance looks at the covariance or correlation coefficient for the securities in the portfolio. Generally, the lower the correlation between securities in a portfolio, the lower the portfolio variance.
Investopedia Says

Investopedia explains 'Portfolio Variance'


Portfolio variance is calculated by multiplying the squared weight of each security by its corresponding variance and adding two times the weighted average weight multiplied by the covariance of all individual security pairs. Modern portfolio theory says that portfolio variance can be reduced by choosing asset classes with a low or negative correlation, such as stocks and bonds. This type of diversification is used to reduce risk.

Portfolio variance = (weight(1)^2*variance(1) + weight(2)^2*variance(2) + 2*weight(1)*weight(2)*covariance(1,2)

comments powered by Disqus
Hot Definitions
  1. Chicago Mercantile Exchange - CME

    The world's second-largest exchange for futures and options on futures and the largest in the U.S. Trading involves mostly futures on interest rates, currency, equities, stock indices and agricultural products.
  2. Private Equity

    Equity capital that is not quoted on a public exchange. Private equity consists of investors and funds that make investments directly into private companies or conduct buyouts of public companies that result in a delisting of public equity.
  3. Valuation

    The process of determining the current worth of an asset or company. There are many techniques that can be used to determine value, some are subjective and others are objective.
  4. Valuation

    The process of determining the current worth of an asset or company. There are many techniques that can be used to determine value, some are subjective and others are objective.
  5. Tech Street

    A term used in the financial markets and the press to refer to the technology sector. Companies like Intel, Microsoft, Apple and Dell are all considered to be part of Tech Street.
  6. Tech Street

    A term used in the financial markets and the press to refer to the technology sector. Companies like Intel, Microsoft, Apple and Dell are all considered to be part of Tech Street.
Trading Center