Logarithmic graphs are generally useful if you are dealing with data that varies across several orders of magnitude. Say, for instance you have some variable with values ranging from a few hundred to a few hundred thousand. If you try to plot the data on a linear plot, all your values at lower orders of magnitude get clustered together near the graph’s origin. Plotting this data on a logarithmic graph helps spread out those lower values and makes it easier to see trends that might be present.
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