an index number in which the value at any given period is related to a base in the previous period,as distinct from one which is related to a fixed base
Indeksiridu võidakse kujundada kahel viisil: alus- ehk baasindeksid arvutatakse ühe võrdlusaluse, nt uuritava nähtuse 1913., 1939. või 1950. a. taseme suhtes, ahelindeksite võrdlusalus on alati eelmine periood (aasta).
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