Correlation is the statistical linear correspondence of variation between two variables. It combines two related statistical concepts: variance and standard deviation.

Comparing two columns in Excel doesn’t have to be a difficult task, and to get the job done, we suggest using VLOOKUP.You see, not always; the columns you want to compare are in the same ...

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.