But either way, this is the model that I'm just, through eyeballing, this is my regression line, something that I'm trying to fit to these points. But clearly it can't go through, one line won't be able to go through all of these points. There is going to be, for each point, some difference, or not for all of them, but for many of them, some difference between the actual and what would have been predicted by the line. And that idea, the difference between the actual four-point and what would have been predicted given, say, the height, that is called a residual. Let me write that down. The residual for each of these data points. And so, for example, if I call this right here, if I call that 0.1, the residual for 0.1 is going to be, well, for our variable, for our height variable, 60 inches, the actual here is 100 pounds, and from that we would subtract what would be predicted.