In the financial parlance, the term “covariance” is primarily used in portfolio theory, and it refers to the measurement of the relationship between the returns of two stocks or other assets and can be calculated based on returns of both the stocks at different intervals and the sample size or the number of intervals. How to Calculate the Variance in a Portfolio. As a result, there are numerous measurements for risk in the investment community. In case the greater values of one variable are linked to the greater values of the second variable considered, and the same corresponds for the smaller figures, then the covariance is positive and is a signal that the two variables show similar behavior. In data analysis and statistics, covariance indicates how much two random variables change together. person_outlineTimurschedule 2019-02-27 13:23:49. Covariance Calculator (from a Correlation Coefficient) This calculator will compute the covariance between two variables X and Y, given the Pearson correlation coefficient for the two variables, and their standard deviations. I assume you want to find the mean-variance portfolio by estimating the optimal weights of each asset. Consider an investor is planning to invest in three stocks which is Stock A and its expected return of 18% and worth of the invested amount is $20,000 and she is also interested into own Stock B $25,000, which has an expected return of 12%. It's an online statistics and probability tool requires two sets of population data `X` and `Y` and measures of how much these data sets vary together, i.e. Covariance calculator. Using the variance-covariance method; In this post, we'll focus on using method (2) (variance-covariance). How does this covariance calculator work? This online calculator computes covariance between two discrete random variables. Covariance Calculator estimates the statistical relationship (linear dependence) between the two sets of population data `X` and `Y`. Calculating portfolio variance for a portfolio of two assets with a given correlation is a fairly trivial task – you use the formula to get the portfolio variance, and take the square root to get the standard deviation or volatility. This online calculator computes covariance between two discrete random variables. It also shows the expected value (mean) of each random variable. This variability of returns is commensurate with the portfolio's risk, and this risk can be quantified by calculating the standard deviation of this variability. Please enter the necessary parameter values, and then click 'Calculate'. Portfolio risks can be calculated, like calculating the risk of single investments, by taking the standard deviation of the variance of actual returns of the portfolio over time. it helps us to understand how two sets of data are related to each other. Portfolio Return = (60% * 20%) + (40% * 12%) Portfolio Return = 16.8% Portfolio Return Formula – Example #2. However, in order to calculate the volatility of the entire portfolio, we will need to calculate the covariance matrix . In the financial world, risk is the nemesis of return; that is, investors are usually forced to find the balance between the two, but most would prefer a no-risk, high-return investment. 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