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In the simplest case, you select one period to represent the base period. Suppose the value of the variable for this period is V.

The index is calculated by multiplying the value for each period by 100/V. This results in the base period having an index of 100 and all the other periods are represented by their percentage relative to the base period.

Things get more complicated when you consider (mainly) economic index numbers such as price indices. A simplistic description of a price index is as follows: identify a "basket" of goods and services that the price index is required to cover. Calculate a price index for each item using the same base year. Then calculate the weighted average of these indices, where the weights reflect the importance of the goods in the total spend - either in the base period or the current period.

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12y ago

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Q: Method of construction of index number?
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