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Sam

Removing the "All" graph would make it possible to write the labels next to the other graphs (and remove the legend).

junkcharts

Sam: ...assuming it's not important for readers to know the total size of the market. If I am paid to produce this chart, I'd have opened this in Illustrator, removed the legend, and placed the text labels next to the lines.

zbicyclist

What are the most important things to show here?
1. How fast is the total market growing? (the "All" line)
2. Which manufacturers are more/less successful in participating?

Kaiser's last graph shows these, but the manufacturer results are squeezed down.

I know it's unpopular to suggest graphing one of these on the right axis (e.g. "All") and the rest on the left axis, but if I could only do one graph that's what I'd do here.

jlbriggs

@zbicyclist but in what circumstance could you only make one graph? (the original chart takes up a fair amount of space which could be easily used to include two charts instead)

Plotting these values to separate axes on the same chart is not just unpopular, it's unpopular because it's a very bad idea.

I would much prefer to see two charts, one above the other: one for the overall, one for the individual categories.

junkcharts

jlbriggs: try making two charts and you'll realize there is a design choice. On one chart, it's easier to see the market share of each brand against the overall. So it's a question of what you want to emphasize. For this data set, I don't see much of interest in the individual lines, do you?

jlbriggs

I can see an argument for showing the comparison between companies, sure.

But I see your point.

Either way, what I certainly would *not* do or condone is plotting the individual lines to a secondary axis that is scaled independently on the same chart as the overall.

Glenn

The dilemma of showing the ALL line with the individual lines is created because you moved from the stacked bar to the line chart. I don't see anything wrong with stacked bars if you want to emphasize the "parts of a whole" concept, although I agree that the number of segments should be kept to a minimum, as shown in the 3rd chart. So it depends on what you want to emphasize.

Also stacked bars work well in interactive software where you can filter on a segment to see the trend for that segment only or if you want to drill down to the next level of detail, such as manufacturers to models in this case. Also, many people also want to see the values, in which case you wouldn't want to smooth the data.

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