Regression is concerned with the relationship between two quantities. For instance, a person’s height in relation to their weight or a car’s values compared to its age. If we record values of these, we can plot the points on a graph. This type of graph is called a “scatter” graph because the points seem scattered about the graph.
The preceding two graphs are scatter graphs. The top graph shows height plotted against weight for different people. The bottom graph shows the value of one particular make and ...
