Code of Federal Regulations - Title 5: Administrative Personnel (December 2005)
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TITLE 5 - ADMINISTRATIVE PERSONNEL
CHAPTER I - OFFICE OF PERSONNEL MANAGEMENTSUBCHAPTER B - CIVIL SERVICE REGULATIONSPART 591 - ALLOWANCES AND DIFFERENTIALSsubpart b - COST - OF - LIVING ALLOWANCE AND POST DIFFERENTIAL - NONFOREIGN AREAS591.218 - How does OPM compute price indexes?Except for shelter and energy utilities, OPM averages by item the prices collected in each survey area. For the Washington, DC, area, OPM computes a simple average for each item based on the average prices from each DC survey area. On an item-by-item basis, OPM divides the COLA survey area average price by the DC average price and produces a price index.