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Outdoor Lighting and Crime - Amper

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FIGURE 11. CRIME RATE AND UPWARD LIGHT ENERGY LOSS<br />

IN CANADIAN CITIES<br />

CRIME RATE %<br />

9<br />

8<br />

7<br />

6<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

y = 0.0701x + 4.5826<br />

r 2 = 0.3072<br />

178<br />

0 50 100 150 200 250<br />

ANNUAL LIGHT ENERGY LOSS / AREA, MW.h/km 2<br />

Figure 11. <strong>Crime</strong> rate in 1999 for nine cities in Canada, plotted against annual upward light<br />

energy loss per unit area measured by satellite in 1997. Light energy loss data are from Isobe<br />

<strong>and</strong> Hamamura (1998). <strong>Crime</strong> data for 1999 have been calculated from 2000 data from<br />

Statistics Canada (2001). Numerical data are given in Table 7. No corrections are made for<br />

snow cover. The unfilled data point is for Trois Rivières, which is excluded from the linear<br />

regression analysis as an outlier. The slope of the regression line is not significantly different<br />

from zero. Including Trois Rivières makes the regression line slope slightly negative, but<br />

again not reliably different from zero.

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