When you are talking about data that is not continous. When you are talking about data that is not continous.
To compare any two sets of data !
A double line graph is used to compare two sets of data. Usually the data is taken over a period of time and compared at set intervals.
They are used for when each data group contains two different sets of frequency data. A double bar graph is used to compare both between and within data groups
when a sets of data can be separated by 2 orders of variables, which are the independent & dependent variables.
A double bar graph plots two sets of data on a single chart, whereas a bar graph plots just one.
To compare any two sets of data !
A double line graph is used to compare two sets of data. Usually the data is taken over a period of time and compared at set intervals.
They are used for when each data group contains two different sets of frequency data. A double bar graph is used to compare both between and within data groups
double line graph
Bar graphs can compare two sets of data, as well as line graphs and circle graphs. To better improve my answer, double line graphs and double bar graphs compare two sets of data. Circle graphs cannot however, because they compare parts of a whole instead of, as a bar graph would, the amount of something. A circle graph is also incapable of showing data growth over a period of time, as line graphs do. All in all, circle graphs cannot compare to sets of data, and bar graphs and line graphs must be doubled to do so.
a double bar graph
when a sets of data can be separated by 2 orders of variables, which are the independent & dependent variables.
to show a comparison of two sets of data
I suggest a scatter-graph of line graph, with time as the independent axis.
A double bar graph plots two sets of data on a single chart, whereas a bar graph plots just one.
A double bar graph shows two sets f data in one chart. A bar graph just shows one.
The advantage is that you can compare multiple data sets in the same chart