![]() Three multiples is better than just 1 single chart. That's why small multiples are one of the most efficient methods in data visualization. Hence, the tornado chart.Īs you see, adding charts for multiple years helps gain a deeper understanding. In fact, the population will keep ageing and by 2053 this chart will look more like a tornado. However, we get the whole story by adding more recent data and a forecast for the future:ĭue to rapid changes in the age structure of the population, the population "pyramid" in 2013 does not look like a pyramid anymore. Well, that was way back in 1953 when the population structure in Slovenia still looked like a pyramid. Here's how the population in Slovenia looked like in 1953, by age and gender: ![]() Presenting a population pyramid with the butterfly chart has been a de-facto standard for years. Population pyramid: from a pyramid to a tornado Let's take a closer look at the following three examples: In general, you may use it as an alternative to a regular bar chart or a stacked bar chart, whenever you're presenting two (or more) opposing data sets. negative opinions, presenting election results (e.g. A butterfly chart is a special type of bar chart, often used to represent two data series side by side, such as comparing male vs.
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