This post is by Phil Price.
I think this is one of the worst I have ever seen. I don’t know where it came from, so I can’t give credit/blame where it’s due.
Let’s put aside the numbers themselves – I haven’t checked them, for one thing, and I’d also say that for this comparison one would be most interested in (government money plus donations) rather than just donations — and just look at this as an information display. What are some things I don’t like about it? Jeez, I hardly know where to begin.
1. It takes a lot of work to figure it out. (a) You have to realize that each color is associated with a different cause — my initial thought was that the top circles represent deaths and dollars for the first cause, the second circles are for the second cause, etc. (b) Even once you’ve realized what is being displayed, and how, you pretty much have to go disease by disease to see what is going on; there’s no way to grok the whole pattern at once. (b) Other than pink for breast cancer and maybe red for AIDS none of the color mappings are standardized in any sense, so you have to keep referring back to the legend at the top. (c) It’s not obvious (and I still don’t know) if the amount of “money raised” for a given cause refers only to the specific fundraising vehicle mentioned in the legend for each disease. It’s hard to believe they would do it that way, but maybe they do.
2. Good luck if you’re colorblind.
3. Maybe I buried the lede by putting this last: did you catch the fact that the area of the circle isn’t the relevant parameter? Take a look at the top two circles on the left. The upper one should be less than twice the size of the second one. It looks like they made the diameter of the circle proportional to the quantity, rather than the area; a classic way to mislead with a graphic.
At a bare minimum, this graphic could be improved by (a) fixing the terrible mistake with the sizes of the circles, (b) putting both columns in the same order (that is, first row is one disease, second row is another, etc)., (c) taking advantage of the new ordering to label each row so you don’t need the legend. This would also make it much easier to see the point the display is supposed to make.
As a professional data analyst I’d rather just see a scatterplot of money vs deaths, but I know a lot of people don’t understand scatterplots. I can see the value of using circle sizes for a general audience. But I can’t see how anyone could like this graphic. Yet three of my friends (so far) have posted it on Facebook, with nary a criticism of the display.
[Note added the next day:
The graphic is even worse than I thought. As several people have pointed out, my suspicion is true: the numbers do not show the total donations to fight the diseases listed, they show only the donations to a single organization. For instance, according to the legend the pink color represents donations to fight breast cancer, but the number is not for breast cancer as a whole, it's only for Komen Race for the Cure.
If they think people are interested in contributions to only a single charity in each category --- which seems strange, but let's assume that's what they want and just look at the display --- then they need a title that is much less ambiguous, and the labels need to emphasize the charity and not the disease.]
This post is by Phil Price.