Now, the first thing I want to do in this video is calculate the total sum of squares. So I'll call that SST. S-S, sum of squares, total. And you could view it as really the numerator when you calculate variance. So you're just going to take the distance between each of these data points and the mean of all of these data points squared. I mean, just take that sum. We're not going to divide by the degree of freedom, which you'd normally do if you were calculating sample variance.