There are 294 four-digit NAICS industries in the SUSB data; we rank these industries from 1 to 294, with the industry with the largest [x.sub.j] ranked 1.
The BDS is produced by the Census Bureau from longitudinal (annual) establishment-level administrative data similar to the source data for the SUSB discussed above.
To see this, we pool employment change data from the SUSB from 2003 to 2006.
(7.) The national SUSB data are available at the six-digit NAICS level of aggregation.
The SUSB data report expansions and contractions by firm size, by measuring employment changes at the establishment level.
SUSB and especially Enterprise Statistics suffer from shifting definitions and sector coverage.
Data used in the creation of Lorenz curves (Panel A in Figures 15, 17, and 18) and mean firm size series (Figure 14, Panel A) were obtained through Enterprise Statistics and SUSB. Other firm figures (Panel B in Figures 14, 15, 17, and 18, as well as all of Figures 13 and 16) were derived from the BDS series.
Businesses (SUSB) replaced ES in 1992; it was published in 1992, and annually from 1997 onward.
The utility of SUSB is further reduced by the switch to the NAICS classification system from the SIC system after 1997; it is difficult to compare sectors between systems, and, as with CBP, it was necessary to construct a composite service sector from several NAICS subsectors (see Table 4).
While the CPS is not as accurate as the Census Bureau's SUSB in determining the industry workforce by size of firm, it is useful for comparison purposes.
(12) SUSB is a firm-size data source created by the Bureau of the Census from County Business Patterns (an establishment data source) with funding from the Office of Advocacy.
(20) Comparisons are made using 1996 SUSB data; however, the industry shares change little from year to year.