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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. Elements of the Index and SubindexesThe “goods” used in the CPI are organized into expenditure classes (ECs); as of 1999, there were 68 ECs. These are in turn are subdivided into item strata; as of 1998, there were 218 strata. Finally, the item strata are subdivided into entry-level items (ELIs); as of 2000, there were 282 ELIs.14 The following is an example of this hierarchy of goods (Bureau of Labor Statistics, 1997a): Expenditure Class 24: Maintenance and repair commodities Item stratum 2401: Materials, supplies, equipment for home repairs Entry-level items: 24011: Paint, wallpaper, and supplies 24012: Tools and equipment for painting 24013: Lumber, paneling, wall and ceiling tile; awnings, glass 24014: Blacktop and masonry materials 24015: Plumbing supplies and equipment 24016: Electrical supplies, heating and cooling equipment. Item stratum 2404: Other property maintenance commodities Entry-level items: 24041: Miscellaneous supplies and equipment 24042: Hard surface floor covering 24043: Landscaping items Subsequently, the ECs and their components were redesignated; in the 26 March 1999 list of ELIs, EC24 has been restructured as: Expenditure Class HM: Tools, hardware, outdoor equipment and supplies Item stratum HM01: Tools, hardware, and supplies Entry-level items: HM011: Paint, wallpaper tools, and supplies HM012: Power tools HM013: Miscellaneous hardware, supplies, and equipment HM014: Nonpower hand yools Item stratum HM02: Outdoor equipment and supplies Entry-level items: HM021: Powered lawn and garden equipment and other outdoor items HM022: Lawn and garden supplies and insecticides The data used in the CPI are collected in 87 primary sampling units (PSUs; see Williams, 1996). The data are aggregated into 54 basic areas—34 self-representing areas (e.g., Kansas City, MO-KS) and 20 region- and population-size
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