A common approach to understanding relationships between two datasets is simply plotting them against each other. By displaying them in a single scatter plot, we can see correlations, trends or outliers. Quadrant analysis divides this plot into four areas, making it more evident who the leaders and the laggards are. Which countries tend to perform well or badly along both dimensions (bottom-left and top-right quadrants)? Which countries do well in one dimension but not the other?
Upper middle income
Lower middle income
Highest and lowest scoring countries