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Jon Peltier

Two points.

1. The original chart's data spacing is irregular, but the pairs of columns are equidistant. I would have considered a timeline with two series.

2. The term "bumps chart" is misused. A proper bumps chart uses ranks, not values, on the vertical. Tufte described this chart type frequently in his books, but only recently coined the phrase "slope chart", which is pretty descriptive.

Rick Wicklin

In every instance, the "predicted" values are less than the "current" values, so you could also overlay two bar charts: the current in the background and the predicted in the foreground.

Floormaster Squeeze

I also had the same thought as Jon P. above. I would show two series in time (to also help see the accuracy of the "forecast").


Why doesn't the vertical scale start with zero on the Bumps chart ? It seems like the scale on the vertical axis is exaggerating the variability in the numbers, as well as the change between the current and predicted numbers.


you ask, perhaps rhetorically, who needs this information... seems like a good bet that the Citi analyst was addressing an investment in a local parking garage company.

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