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The page below is a sample from the LabCE course Linear Regression Analysis. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Using the Least Squares Formulae

Using the totals from the previous page, shown again on the right, we can calculate the slope of the regression line:

b (slope) = 0.766

We can also calculate the y intercept of the regression line:
17=0.766(14) + a
17= a + 10.724
17 - 10.7.24 = a
6.276 = a

Therefore, the least squares regression line is:

Here is the calculated line, plotted on the original data points: