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Correlation is the statistical linear correspondence of variation between two variables. It combines two related statistical concepts: variance and standard deviation.
Visa is a component of the S&P 500, so there could be a co-correlation between the variables here. There are only 20 observations, which may not be enough to make a good inference.
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How Can You Calculate Correlation Using Excel? - MSNCorrelation measures the linear relationship between two variables. By measuring and relating the variance of each variable, correlation gives an indication of the strength of the relationship.
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