![]() ![]() (The exception is line graph in which the area under the curve is filled we believe these line graphs need to have a zero axis in the vast majority of cases.) As a result, the line graph is freed from the constraint of including 0 as the axis, and thus can zoom into the relevant range to better reveal changes in the dependent variable as the independent variable changes. For example, if we create a bar graph with values 15 and 20 but set the axis at 10, the bar corresponding to 20 has twice the visual weight of the bar corresponding to 15, despite the value 20 being only 4/3 of the value 15.Ī line graph doesn't draw the attention to the absolute magnitudes of the values, because there is little visual density - i.e., ink - below the curve being plotted. Setting the axis above zero interferes with this. ![]() By its design bar graph emphasizes the absolute magnitude of values associated with each category, whereas a line graph emphasizes the change in the dependent variable (usually the y value) as the independent variable (usually the x value) changes.įor a bar graph to provide a representative impression of the values being plotted, the visual weight of each bar - the amount of ink on the page, if you will - must be proportional to the value of that bar. ![]() What is the difference? Why does a bar graph need to include 0 on the dependent axis whereas a line graph need not do so? Our view is that the two types of graphs are telling different stories. ![]()
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