# Logarithmic scale

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## Logarithmic Scale

A scale where the same percentage of change between two data points (with respect to two other data points) may represent different, raw amounts of change. For example, a logarithmic scale of a stock may show a graph where a change from \$4 per share to \$8 per share is the same distance as a change from \$40 per share to \$80.

## Logarithmic scale.

On a logarithmic scale or graph, comparable percentage changes in the value of an investment, index, or average appear to be similar. However, the actual underlying change in value may be significantly different.

For example, a stock whose price increases during the year from \$25 to \$50 a share has the same percentage change as a stock whose price increases from \$100 to \$200 a share.

On a logarithmic scale, it's irrelevant that the dollar value of the second stock is four times the value of the first.

Similarly, the percentage change in the Dow Jones Industrial Average (DJIA) as it rose from 1,000 to 2,000 is comparable to the percentage change when it moved from 4,000 to 8,000.

References in periodicals archive ?
Log characteristics such as length, diameter, sweep, taper, and ellipticality were measured in sawmills, while log scale and grade were determined by using the US Department of Agriculture Forest Service grading rules.
One should carefully note that these numbers are on the log scale.
The slope on log scale algorithm performed slightly better than the random but much worse than the other algorithms.
Spelter (2004) and Fonseca (2005) provide additional information and references about Scribner and other log scales.
The LRF and CLR are better expressions of conversion efficiency than LO because log input is measured in terms of net cubic log scale, eliminating a number of the problems associated with the SLR.
For each study sample log, absolute sweep, small-end diameter, and log length were used to determine sweep log scale deductions.
Therefore, application of the proposed mass wormhole deduction rule resulted in a much lower net log scale for the wormy logs (Table 2) than the actual lumber volume measured in the recovery study.
Values used for the log volumes in the lumber overrun analysis were based upon the International 1/4-inch log scale (USDA FS 1977).
3 inches and greater (12-foot log length basis), and log scale deduction of over 15 percent, lumber yield can be 10 to 12 percent higher when curve sawing.
Forty-eight percent of log scale volume (scaling yield) was converted into clear dimension parts.
0 support, and a number of charting features which include radar charts, log scales, error bars, trendlines, series line smoothing, minor ticks and gridlines, dashed line styles and date scales," said Terry Erickson, Chief Software Architect, SpreadsheetGear LLC.
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