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Take the fallout after Robert Chote, then chair of the OBR, published a chart showing spending levels at their lowest since the 1930s.

Over the course of his seven-decade career, Mr. Cliff recorded more than 25 albums, and three of his singles charted on the Billboard 100.

Technically, the monthly chart suggests a potential entry point.

But the data confirm the correlation, as the chart below shows.

Relative Rotation Graphs, or RRG charts, are a way of depicting the changes in leadership in different groups, such as sectors, countries or regions, or market factors.