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Evaluating the Relationships of 2 Stocks by Covariance

Written by admin
Tue Mar 14 2023
Evaluating the Relationships of 2 Stocks by Covariance - MarketXLS
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Evaluating the Relationships of 2 Stocks by Covariance - MarketXLS

Improve Your Portfolio Strategy with Covariance Analysis

Covariance analysis is a vital tool in portfolio management, providing insights into the degree to which two stocks move together. It is a measure of the relationship between two stocks, ranging from no relationship to high covariance. Understanding covariance is crucial in analyzing the risk associated with holding multiple stocks in a portfolio, and investors should aim for low correlation to diversify their portfolios effectively. By monitoring the covariance of two stocks, investors can make informed decisions about which stocks to include in their portfolios to minimize risk and maximize returns.

How Covariance Impacts Portfolio Returns

Covariance measures how two securities move in relation to each other and is essential in constructing and managing a portfolio. High positive covariance indicates that when one asset increases in value, the other is likely to increase as well, leading to higher portfolio returns. Conversely, high negative covariance leads to a lower return and increased portfolio volatility. Understanding covariance is key to determining portfolio risk and expected return, making it a critical tool in portfolio management.

Mathematically, the covariance between two variables X and Y is defined as the expected value of the product of the deviations of each variable from its mean:

cov(X,Y) = E[(X – E[X]) * (Y – E[Y])]

where E[X] and E[Y] are the expected values (means) of X and Y, respectively.

How can MarketXLS Help?

MarketXLS is a powerful tool that can help investors, traders, and financial professionals increase their efficiency and effectiveness in stock market analysis. It is a combination of a stock research spreadsheet and a stock market data platform. It provides users with a wide range of features such as financial data analysis, charting, and screeners. The user has access to a vast array of real-time market information, such as quotes, news, and ETFs. Additionally, one can access a wide range of resources, including technical analysis and sentiment indicators. MarketXLS can help users save time and effort when performing research, allowing them to make more informed decisions quickly.


In summary, understanding covariance is essential for effective portfolio management. By monitoring covariance, investors can make informed decisions about which stocks to include in their portfolios, minimizing risk, and maximizing returns. With MarketXLS, investors have access to a comprehensive set of tools to help them analyze covariance and build more diversified and profitable portfolios.

Relevant blogs that can help you learn more about this topic include:

Invest Smarter: Use an Efficient Frontier Calculator
How to Calculate Stock Beta in Excel
Maximize Your Portfolio Performance with Efficient Frontier
Correlation Matrix (Measuring Portfolio Diversification)

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I am so happy you are here. My name is Ankur and I am the founder/CEO of MarketXLS. Over the past four years, I have helped more than 2500 customers to implement their own investment research strategies and monitoring systems in Excel.
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