Logarithmic scaling (actually semi-logarithmic scaling; price only is on a common logarithmic scale) enables you to compare percentage price changes rather than absolute price changes. Plotting prices on a semi-logarithmic scale allows the presentation of a uniform picture of performance and permits the easy comparison of instruments that differ widely in dollar amount. Logarithmic scaling is most appropriate when comparing long term charts that cover a wide range of price levels. The chart in the active window may be changed to logarithmic scaling simply by typing in the command .LOG. To return the chart to a normal, or linear, scale, enter the .LINEAR command. The .LOG and .LINEAR commands may also be selected from the rescaling menu.Logarithmic Price Scale Charts