How to calculate variance in R?

In R, calculating variance can be done using the var() function, which takes a vector, matrix, or data frame as its input and returns the variance of the values. You can also calculate variance using the var.test() function, which can be used to test the variance of two or more datasets for equality. Additionally, you can calculate the variance of a specific subset of data by using the subset() function to filter the data before calculating the variance.
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