CPI-W
Article Excerpt: "...The Consumer Price Index for All Urban Consumers: All Items (CPIAUCSL)
is a price index of a basket of goods and services paid by urban
consumers. Percent changes in the price index measure the inflation
rate between any two time periods. The most common inflation metric is
the percent change from one year ago. It can also represent the buying
habits of urban consumers. This particular index includes roughly 88
percent of the total population, accounting for wage earners, clerical
workers, technical workers, self-employed, short-term workers,
unemployed, retirees, and those not in the labor force.
The CPIs are based on prices for food, clothing, shelter, and fuels;
transportation fares; service fees (e.g., water and sewer service);
and sales taxes. Prices are collected monthly from about 4,000 housing
units and approximately 26,000 retail establishments across 87 urban
areas. To calculate the index, price changes are averaged with weights
representing their importance in the spending of the particular group.
The index measures price changes (as a percent change) from a
predetermined reference date. In addition to the original unadjusted
index distributed, the Bureau of Labor Statistics also releases a
seasonally adjusted index. The unadjusted series reflects all factors
that may influence a change in prices. However, it can be very useful
to look at the seasonally adjusted CPI, which removes the effects of
seasonal changes, such as weather, school year, production cycles, and
holidays. ..."
Resource: stlouisfed.org