In Order to Calculate the Regression $R ^ { 2 }$

question 42

Essay

In order to calculate the regression $R ^ { 2 }$ you need the TSS and either the SSR or the ESS . The TSS is fairly straightforward to calculate, being just the variation of Y . However, if you had to calculate the SSR or ESS by hand (or in a spreadsheet), you would need all fitted values from the regression function and their deviations from the sample mean, or the residuals. Can you think of a quicker way to calculate the ESS simply using terms you have already used to calculate the slope coefficient?

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Definitions:

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