Merrill DW, Selvin S, Close ER and Holmes HH. 1995.

Use of Density Equalizing Map Projections
(DEMP) in the Analysis of Childhood
Cancer in Four California Counties

Graphics (25 pages) distributed at the 1995 CDC/ATSDR Symposium on Statistical Methods: Small Area Statistics in Public Health, Atlanta, Georgia, January 25-26, 1995. Most of these were used in the 15-minute oral presentation. These describe the k'th nearest neighbor analysis completed in late January 1995. Significant results were obtained for values of k greater than 1.

text overheads

Title page

Outline

Density Equalizing Map Projections (DEMP)

Conclusions (1 of 2): DEMP Methodology

Conclusions (2 of 2): Four county data set

figures from DHS report

Map 5. Cases Diagnosed in the Four County Childhood Cancer Study Area 1980-1988 (Postscript, 3MB)

Figure 2. Childhood cancer rate ratios (and 95% CI) for Four County communities compared to the overall Four County rate. (Postscript, 3MB)

Map 6. Four County Childhood Cancer Study Communities with High and Low Rates of Childhood Cancer 1980-1988 (Postscript, 3MB)

three density equalized maps: (Postscript)

1 random point in tract of each case

5 random points in tract of each case

20 random points in tract of each case

k'th nearest neighbor, no external points (Postscript)

k'th nearest neighbor analysis, with external points (7 pages, Postscript, 0.5 MB)

1. k'th nearest neighbor, with external points

2. 401 true case locations plus random external cases

3. 20 random samples of 401 artificial cases

4. 401 cases, 20 random locations in tract

5. averages of 20 samples, with 95% confidence limits

6. mean k'th nearest neighbor distance

7. z-statistic of mean k'th nearest neighbor distance

confidence levels (2 pages, Postscript)

1. Poisson based test for census tracts, random cases

2. Poisson based test for census tracts, real cases

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