A century of suicide in Japan

By William Wetherall

Figure 1

Artificial data illustrating contour interpolations

				Age



Age group	20-24		25-29		30-34				35-39

Central age	22		27		32				37



1970	45	50	55		55	60		70	75



	50		60		60



Year 1971	55	60	65		65		70		75
					60				70
			60
					50				60
1972	55		55	50	45		50		55

Notes

The black rates were computed from mortality and popuation data.
The colored rates were inperpolated between the black rates.
The black rates fall on the intersection points of the Year / Age grid.
The colored rates fall on contour lines representing the same rate.