Bridge Between NAICS and SIC
In Table 2, lines showing an SIC code refer to that industry as a whole. Lines showing a NAICS refer to that part of the NAICS that is classified in this SIC. If there is no code in the "Pt" column, then the entirety of the NAICS falls within this SIC. If a Pt code is shown, then a figure is shown to the left of the NAICS that indicates what fraction of the total NAICS sales, receipts or value of shipments (as derived from Table 1) is classified in this SIC. Values that round to 100% or 0% occasionally occur, but should not be construed as all or none.
That percentage figure is also a link to the corresponding part of table 1, where you can see the distribution of other parts of this NAICS. There are no links for NAICS codes entirely within this SIC, since Table 1 would provide no additional information. If you wish to study parts of tables 1 and 2 side by side, you may wish to open Table 1 in a new browser window (right click on the link).
On 4-digit SIC lines, symbols in the second column define comparability in terms of the relationship between the actual SIC sales, receipts or value of shipments, and the value that would be obtained by summing all NAICS codes with a value associated with this SIC greater that 50%. If those two figures are the same, the SIC and NAICS are deemed to be comparable (bridge complete). If the figures are within 3 percent, they are deemed almost comparable (drawbridge slightly open).
Where more than one NAICS part is identified within a single SIC, then a separate summation line is shown.
The symbol is used as a link to the 1992 figures shown in Comparative Statistics. Note that there are links only for SICs, not for NAICS codes.