Sudden Infant Death Syndrome (SIDS) sample data for North Carolina counties,
two time periods (1974-78 and 1979-84). The details of the columns can be
found on the seealso URL, spdep package's vignette. Please note that,
though this is basically the same as nc.sids dataset in spData
package, nc only contains a subset of variables. The differences are
also discussed on the vignette.