You can only make a stacked bar graph if one of the groups is always smaller than the other.
Otherwise one bar might go right over the other one.
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The above disadvantage does not apply to stacked bars where the bar for each variable is stacked on top of other bars. The main disadvantage is that it becomes increasingly difficult to see changes in all but the variable that is at the bottom of the stack (and so has a fixed bottom line).
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no a double bar graph is better
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For an ordinary bar graph you need two variables, the dependent variable being numerical. You need at least two observations - unless you want a bar graph that serves no purpose. You could have more than one dependent variables for a stacked or grouped bar graph.
You can either use multiple bars: these are bars for single variables which appear in groups. Sometimes it is appropriate to use stacked bars, where the bar for the groups are stacked, one on top of another.
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no a double bar graph is better
In a normal bar graph, each bar represents one value. In a stacked bar graph, each bar has a number of values, stacked on top of each other. So a bar can show how a total is broken down. So each bar could represent a year, with the amounts for each month indicated by different parts of that one bar.
A pie or a stacked bar.A pie or a stacked bar.A pie or a stacked bar.A pie or a stacked bar.
A pie or stacked bar.
A pie chart or a stacked bar chart.
In a normal bar graph, each bar represents one value. In a stacked bar graph, each bar has a number of values, stacked on top of each other. So a bar can show how a total is broken down. So each bar could represent a year, with the amounts for each month indicated by different parts of that one bar.
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A pie chart or a percentage-stacked bar.
For an ordinary bar graph you need two variables, the dependent variable being numerical. You need at least two observations - unless you want a bar graph that serves no purpose. You could have more than one dependent variables for a stacked or grouped bar graph.
Pie or 100% stacked bar charts.
A percentage stacked-bar chart or a pie chart are two common ways.