Bar charts are used for comparing different pieces of data to each other, using horizontal bars. Categories are organised vertically, values horizontally, to focus on comparing values and to place less emphasis on time. Stacked bar charts show the relationship of individual items to the whole. Bar charts can sometimes be used as a way of making charts for project management.
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A bar chart is used when you have a standard column and a variable column, it is used to indicate the differences of the variable in each of the standard.
You can use a stacked bar chart.
A pie chart can be used to do this. You could also use a stacked bar chart.
Bar charts are used to summarise nominal or ordinal data.