index number

noun Statistics.
a quantity whose variation over a period of time measures the change in some phenomenon.
Also called index.

1870–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
index number
statistics a statistic indicating the relative change occurring in each successive period of time in the price, volume, or value of a commodity or in a general economic variable, such as the price level, national income, or gross output, with reference to a previous base period conventionally given the number 100

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The lower the index number, the better the impact on glucose levels.
It is helpful if a filing date and index number is available when searching the
To pay court fees in order to obtain a court service, such as buying an index
  number to start a proceeding.
Discrete index number for each part not to exceeded seven characters.
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