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The linear scale shows the absolute number of widgets over time while the logarithmic scale shows the rate of change of the number of widgets over time. The bottom chart of Figure 4 makes it much clearer that the rate of change or growth rate is constant. Dr.

A logarithmic scale shows exponential growth on a graph. It's a nonlinear scale that's frequently used for analyzing a large range of quantities compactly. It is extremely useful when graphing a large variance in data.

Human hearing is better measured on a logarithmic scale than a linear scale. On a linear scale, a change between two values is perceived on the basis of the difference between the values: e.g., a change from 1 to 2 would be perceived as the same increase as from 4 to 5.

A logarithmic price scale uses the percentage of change to plot data points, so, the scale prices are not positioned equidistantly. A linear price scale uses an equal value between price scales providing an equal distance between values.

Under a log-linear model the rates change at a constant percent per year (i.e. a fixed annual percent change - APC), while for a linear model the rates change at a constant fixed amount per year.

A logarithmic or semi-logarithmic line chart has a logarithmic scale on the y (vertical) axis and an arithmetic scale on the x (horizontal) axis. These charts are useful for comparing relative (percentage) changes, rather than absolute amounts of change, for a set of values.

Logarithmic price scalealso referred to as logrepresents price spacing on the vertical or y-axis dependent on the percentage of change in the underlying asset's price. This is usually the default chart style.

There are two main reasons to use logarithmic scales in charts and graphs. The first is to respond to skewness towards large values; i.e., cases in which one or a few points are much larger than the bulk of the data. The second is to show percent change or multiplicative factors.

Presentation of data on a logarithmic scale can be helpful when the data: covers a large range of values, since the use of the logarithms of the values rather than the actual values reduces a wide range to a more manageable size; may contain exponential laws or power laws, since these will show up as straight lines.

Select the "Scale" tab on the Format Axis window. Click the "Logarithmic Scale" check box near the bottom of the window. This changes the chart's axis to a log scale.