What is SS_xx?

In statistical analysis, SS_xx stands for the sum of squared deviations of the x values from their mean. This measure is crucial for understanding the variability of the x values around their average.

The formula for SS_xx is the sum of the squared differences between each x value and the mean of the x values. The notation (x(i)-(x-bar))^2 indicates that each x value is subtracted from the mean of the x values, and the result is squared.

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The term being referred to here represents the average of the x values. It is computed by summing up all the individual x values and then dividing the total by the number of observations, n.

Similarly, y-bar denotes the mean of the y values. This is obtained by summing up all the y values and dividing the result by n.