The COADS dataset is a source of valuable information, however, it
is not error free. Most errors were eliminated during the processing
of the raw data, and reports with known errors have been identified.
But, as noted in COADS Release 1 documentation: "some kinds of errors
cannot be trapped by statistical methods." For a complete description
of COADS limitations, refer to the COADS Release 1 document listed in
the footnote on the first page.