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Consumer Price Index Geographic Revision for 2018

The Bureau of Labor Statistics’ Website states (www.bls.gov):
 
“In January 2018, the Bureau of Labor Statistics (BLS) introduced a new geographic area sample for the Consumer Price Index (CPI). As part of the new sample, Washington DC and Baltimore will have separate indexes. The first indexes using the new structure will be published in February 2018. Additional information on the geographic revision is available at: www.bls.gov/cpi/georevision2018.htm.
 

According to the Bureau of Labor Statistics (“BLS”), in 2018, Anne Arundel County will fall into the area used for the Baltimore (Baltimore-Columbia-Towson) index.

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Anne Arundel County, Maryland, has elected to handle the change in the following manner as suggested by the BLS:

Inconveniently, the Baltimore-Columbia-Towson index is bimonthly and is published for even months starting this year, but is available for odd months in the past. So, there aren’t clear 12-month changes available this year. The solution, as suggested by BLS, is to estimate indexes in even months of last year as the geometric average of the two surrounding months and use those as the basis for computing 12-month changes. The first change for 2018 was in February at a 2.2% change. The next month to be published is April 2018. That data will be released by the BLS on May 10, 2018, at 8:30 a.m.

 

Note that a December 2017 index was published, so as of the publication of the December 2018 index, this problem will be resolved.