Administration & Information, Dept. of

Wyoming Cost of Living Index

Effective Date: 12/09/1999 to Current

Rule Type: Current Rules & Regulations

Reference Number: 006.0007.4.12091999

Chapter 4

Calculation of the Comparative Index

Section 1. Price Data to be Used for Each County. For counties with price data from multiple communities, a population weighted average price for that county will be calculated. For counties with price data from only one community, the price data for that community will be used as the county price data.

Section 2. Statewide Average Price. A Statewide Average Price will be calculated for each item. The Statewide Average Price for an item will be the population weighted average of the county prices.

Section 3. Formulas Used to Estimate the Comparative Index. A comparative index number for each county will be calculated.

(a). Each county's index number will be calculated in the following manner: Each item's price in a county will be divided by the Statewide Average Price for the item. The resulting number will be multiplied by the item's weight, and all items will then be summed to calculate the county's all items index number.

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where: P = Price,

w = weight,

i = item,

j = county,

n = number of priced items,

SWA = State Wide Average.

(b). To calculate individual category index numbers, the formula in Chapter 4, Section 3. (a). will be used, but only those items in the category will be summed. In addition, the resulting number will be divided by the sum of the weights of all items in the category and then multiplied by 100.