CASE STUDIES IN BIOMETRY: Chapter 1.

Spatial Pattern Analyses to Detect Rare Disease Clusters

Lance A. Waller, Bruce W. Turnbull, Larry C. Clark, and Philip Nasca

The file ch1a.dat is the case data file. It contains the
following variables.  There are no missing values.

ID: Integer, 10 character long identification number for
        a "cell" or census district in the study area.

x: Real, range (-60.85, 54.13), x-coordinate of the geographic
	centroid of each cell.

y: Real, range (-78.64, 58.30), y-coordinate of the geographic
	centroid of each cell.

pop:  Integer, range (3, 12221), 1980 U.S. Census population
                 count for each cell.

cases: Real, range (0, 9.29), incident cases of leukemia (all
        types) occurring between 1978 and 1982 in each cell.  Fractional
        values can occur due to partially missing data (see text).


Note:  The authors give permission to use the  data freely for
noncommercial
purposes.