Econimist’s daily chart is a one of my daily data porn stops. They take interesting data sets and visualize in compelling ways. While the daily chart page is insightful, sometimes they make poor charting choices. For example, this recent chart visualizing how countries spend their money uses a variation of notorious bubble chart. Click on the chart to enlarge.
What is wrong with this chart?
Bubble charts force us to measure and compare areas of circles. Unless you have a measuring tape somehow embedded in your eyes and you are a walking human scientific calculator, you would find this task impossible.
So when you look at the chart and want to find out what percentage Japanese spend on restaurants or how much Americans pay for housing, your guesses will have large error margins.
Not only bubble charts are difficult to read, they are very hard to align. So when you have a bunch of bubbles, no matter how hard you try, your chart looks clumsy (see how the Russian food bubble eats in to Mexico’s bubble, as if it is too hungry 😉 )
Let’s check out a few alternatives to this chart
The simplest alternative for all the bubble madness? Use bar charts!
Bar charts are easy – you can make them in no-time, your audience can read them in no-time. 2X time saved. What not to like 🙂
Alternative 0 – Straight replacement of bubbles with bars:
This one is simple. We take the data, apply conditional formatting > data bars on top of it. We can add an additional rule to show only MIN & MAX values in each row and hide the rest of the values with a custom formatting code – ;;;
This is what you get:
The above chart is way better than bubbles. If you want to shift the focus from country to expense category, you can transform the same chart.
Related resources:
Alternative 1 – Transformed bar chart
Again, same techniques, applied on transformed data set.
Alternative 2 – Highlighting above & below average values in different colors
While conditional formatting data bars are fun and simple, they can only show up in one color. So if you want a few bars to be in different color based on a condition (for ex: all values less than average in different color), you need to venture beyond the data bars.
We can use 2 techniques:
- Create in-cell bar charts, using REPT formula and color the bars with conditional formatting
- Create a regular bar chart with two series of data – above & below average and color them differently
REPT formula approach is fun and easy. Using that, we get this:
Related resources:
Alternative 3 – Adding labels to MIN & MAX values too
Once we have the REPT() based chart, we can add extra columns to conditionally show the data labels too.
This is what we get:
Download ‘how they spend’ chart alternatives
Click here to download the Excel workbook containing all these charts. Examine the formulas & conditional formats to learn more.
More charting stories & case-studies
Check out below examples to learn few more powerful ways to tell stories using charts. 
- Changing stubborn opinions with visualizations
- Narrating the story of change – Excel charting case study
- Evolution of Facebook privacy policies – Excel Panel Chart
- Visualizaing survey results – incell panel chart
How would you visualize this data?
What do you feel about the bubble chart? If you think it is a poor choice, how would you visualize this data? Please share your thoughts and implementations in the comment section.
14 Responses to “Group Smaller Slices in Pie Charts to Improve Readability”
I think the virtue of pie charts is precisely that they are difficult to decode. In many contexts, you have to release information but you don't want the relationship between values to jump at your reader. That's when pie charts are most useful.
[...] link Leave a Reply [...]
Chandoo,
millions of ants cannot be mistaken.....There should be a reason why everybody continues using Pie charts, despite what gurus like you or Jon and others say.
one reason could be because we are just used to, so that's what we need to change, the "comfort zone"...
i absolutely agree, since I've been "converted", I just find out that bar charts are clearer, and nicer to the view...
Regards,
Martin
[...] says we can Group Smaller Slices in Pie Charts to Improve Readability. Such a pie has too many labels to fit into a tight space, so you need ro move the labels around [...]
Chandoo -
You ask "Can I use an alternative to pie chart?"
I answer in You Say “Pie”, I Say “Bar”.
This visualization was created because it was easy to print before computers. In this day and age, it should not exist.
I think the 100% Bar Chart is just as useless/unreadable as Pies - we should rename them something like Mama's Strudel Charts - how big a slice would you like, Dear?
My money's with Jon on this topic.
The primary function of any pie chart with more than 2 or 3 data points is to obfuscate. But maybe that is the main purpose, as @Jerome suggests...
@Jerome.. Good point. Also sometimes, there is just no relationship at all.
@Martin... Organized religion is finding it tough to get converts even after 2000+ years of struggle. Jon, Stephen, countless others (and me) are a small army, it would take atleast 5000 more years before pie charts vanish... patience and good to have you here 🙂
@Jon .. very well done sir, very well done.
good points every one...
I've got to throw my vote into Jon's camp (which is also Stephen Few's camp) -- bars just tend to work better. One observation about when we say "what people are used to." There are two distinct groups here (depending on the situation, a person can fall in either one): the person who *creates* the chart and the person who *consumes* the chart. Granted, the consumers are "used to" pie charts. But, it's not like a bar chart is something they would struggle to understand or that would require explanation (like sparklines and bullet graphs). Chart consumers are "used to" consuming whatever is put in front of them. Chart creators, on the other hand, may be "used to" creating pie charts, but that isn't an excuse for them to continue to do so -- many people are used to driving without a seatbelt, leaving lights on in their house needlessly, and forwarding not-all-that-funny anecdotes via email. That doesn't mean the practice shouldn't be discouraged!
[...] example that Chandoo used recently is counting uses of words. Clearly, there are other meanings of “bar” (take bar mitzvah or bar none, for [...]
[…] Grouping smaller slices in pie chart […]
Good article. Is it possible to do that with line charts?
Hi,
Is this available in excel 2013?