Are you referring to this example: https://variancecharts.com/examples/bar_grouped/ https://variancecharts.com/examples/bar_grouped/ ? I tend to prefer horizon

Are you referring to this example: https://variancecharts.com/examples/bar_grouped/ https://variancecharts.com/examples/bar_grouped/ ? I tend to prefer horizontal bar to vertical bar charts for English graphics because the label text reads left-to-right, making it easier to read. It's a good observation though; readers often expect the independent variable to be on the abscissa. We'll be discussing these kinds of graphical decisions in a series of free articles on the site.