ANOVA and regression calculations

The Excel output also includes multiple R, which as previously noted is in this case equal to the correlation coefficient, r, the standard error (= s ), and the further terms R square and adjusted R square, usually abbreviated R. The two latter statistics are given by Excel as decimals, but are often given as percentages instead. They are defined as follows  

In the case of a straight line graph, R is equal to r, the square of the correlation coefficient, i.e. the square of multiple R. The applications of R and R to problems of curve fitting will be discussed below. 

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