Scatter plots

Put two measures on one chart, one point per country, to see how they relate in the same year. A pattern shows that two things go together; it does not show that one causes the other.

Ready-made plots

How to read a scatter plot

Each point is one country, placed by its value on two measures for the same year. Points that rise from left to right show that the two measures tend to be high together; points that fall show the opposite. Points far from the overall pattern are the interesting exceptions.

Each plot states the correlation, a number from −1 to 1 for how closely the points follow a straight line, and names the countries furthest from the pattern. Two measures that go together are not proof that one causes the other: both can depend on a third thing, such as income. Methodology