Actually, pie charts are fine 👍
A lot of people are against using pie charts including some data visualization experts.
But here’s the thing… they’re all wrong.. well, sort of.. let me explain…
The basic case against pie charts is that they aren’t good for comparing categories against each other.
If I have data for different vehicle types on the road for example, a pie chart doesn’t do a good job of telling me there are more trucks than SUVs, because these two slices look about the same.
In other words, it’s hard to compare the size of the slices against each other because you’re kind of comparing the area of each slice.
Whereas in a bar chart, the size difference is clear because you’re comparing the length of each bar, not the area.
But let’s say I wanted to show the portion cars and trucks together make up of the total. In a bar chart, it’s kind of hard to tell that these two categories together account for about 2/3rds of all vehicles. Put this in a pie chart though, and it’s a lot more clear.
That’s because our brains naturally associate circles with 100%, so it’s easy to understand visually the portion one section makes up of the total.
For most situations a bar chart is a really good choice. But, when you’re trying to show the portion one or multiple categories make up of the total, there’s nothing better than a classic pie chart.
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