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.
Farlex Financial Dictionary. © 2012 Farlex, Inc. All Rights Reserved

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.

Dictionary of Financial Terms. Copyright © 2008 Lightbulb Press, Inc. All Rights Reserved.
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You'll find endnotes, a few footnotes and even a couple of graphs that presume, God help us, a familiarity with logarithmic scales. Had Dunbar actually succeeded in making his quirky argument stick, the book would have been a towering achievement, something up there with Steven Pinker's The Language Instinct.
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[M.sub.c], both on logarithmic scales, where [M.sub.c] is the average inter-crosslink molecular weight of the elastomer.