Grouped and Stacked barplot

The hardest part in stacked area chart creation is the use of the d3.stack() function to stack the data. Once this step is done, each group can be added thanks to the d3.area() function. I strongly advise to understand how to do a basic area chart before trying the examples below.

Area chart

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You probably want to understand how to build a basic area chart before trying the stacked version.

A stacked area chart showing the evolution of a few baby names in the US. Zoom on a specific time frame through brushing. Highlight a specific group by hovering the legend. Double click to unzoom.

Likert package

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The Likert package allows to build visualization for questionnaire answers