Should not be called directly.
Used by concord() function to perform concordance to and/or from NAICS and SIC (via HS.)
The following strings can be used as arguments for origin
or
destination
: "hs" (for HS Combined), "hs0" (1988/92), "hs1" (1996), "hs2" (2002),
"hs3" (2007), "hs4" (2012), "isic2", "isic3", "sitc1", "sitc2", "sitc3", "sitc4", "sic", "naics",
and "bec".
Also performs concordance of truncated (shorter) or disaggregated (longer) codes.