Relative Change And Difference
In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes" of the things being compared. The comparison is expressed as a ratio and is a unitless number. By multiplying these ratios by 100 they can be expressed as percentages so the terms percentage change, percent(age) difference, or relative percentage difference are also commonly used. The distinction between "change" and "difference" depends on whether or not one of the quantities being compared is considered a standard or reference or starting value. When this occurs, the term relative change (with respect to the reference value) is used and otherwise the term relative difference is preferred. Relative difference is often used as a quantitative indicator of quality assurance and quality control for repeated measurements where the outcomes are expected to be the same. A special case of percent change (relative change expressed as a percentage) called percent error occurs in measuring situations where the reference value is the accepted or actual value (perhaps theoretically determined) and the value being compared to it is experimentally determined (by measurement).
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Famous quotes containing the words relative, change and/or difference:
“To revolt is a natural tendency of life. Even a worm turns against the foot that crushes it. In general, the vitality and relative dignity of an animal can be measured by the intensity of its instinct to revolt.”
—Mikhail Bakunin (1814–1876)
“You can’t change what happened between you and your ex-spouse, but you can change your attitude about it. Forgiveness doesn’t mean that what your ex did was right or that you condone what he or she did; it simply means that you no longer want to hold a grudge. Forgiveness is not a gift for the other person; it is a purely selfish act that allows you to put the past behind you.”
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“Today’s difference between Russia and the United States is that in Russia everybody takes everybody else for a spy, and in the United States everybody takes everybody else for a criminal.”
—Friedrich Dürrenmatt (1921–1990)