A-manual-for-writers-of-research-papers-theses-and-dissertations

In standard bar charts, each bar represents 100% of a whole. But some times it helpsreaders if they can see specific values for parts of the whole. You can do that in two ways:A “stacked bar” chart subdivides the bars into proportional parts, as in the chart on theleft in figure 8.6.A “grouped bar” chart uses a separate bar for each part of the whole but groups the bars,as in the chart on the right in figure 8.6.Use stacked bars only when it's more important to compare whole values than it is tocompare their segments. Readers, however, can't easily gauge proportions by eye alone, so ifyou do use stacked bars, do this:Arrange segments in a logical order. If possible, put the largest segment at the bottom inthe darkest shade.Label segments with specific numbers and connect corresponding segments with greylines to help clarify proportions.