"...Federal and military retirees might have noticed a slight dip in 2015 cost-of-living adjustment calculations, based on the latest data from the Labor Department.
The exact cost-of-living adjustment for next year won’t be known until October when all the numbers are in, but plugging into the formula the latest available data results in a 1.8 percent increase, down a bit from the 1.9 percent estimate based on June statistics. The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) fell 0.1 percent in July, after increasing in May and June. The CPI-W measures price changes in food, housing, gas and other goods and services; the annual COLA for retirees is based on CPI-W data...."