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11
If these 23 deaths are added to those registered in the district, the actual
number of resident deaths becomes 475 instead of 452 (252 males and 223
females) and the death-rate for the year would be 14.3 instead of 13.9 per 1000.
In calculating the death-rate of any district, fcur main factors have to be
taken into consideration: (1) the number of inhabitants, (2) the number of
deaths registered, (3) the deaths of non-residents registered in the district and
(4) the deaths of residents registered in other districts.
These various factors have a marked influence on the death-rate for the
year, and it is useful to know whether they have been taken into account in
making the calculation. To show how the figures can be altered, the death-rate
of this district for the year has been worked out in several different ways, and
the results set out for comparison. It will be seen that six different death-rates
can be calculated, each accurate according to the method used, and the estimate
of the population taken as the basis.
The two estimates are (a) the mathematical or official one, calculated by
logarithms, by which the population is 33194, and (b) the inhabited houses or
rate book estimate by which the population is 35060. The results are as
follows:—
1. All deaths registered.
(a). Mathematical population 20 3
(b). Eate book „ 19 2
2. Eegistered deaths of residents only.
(a). Mathematical population 13 6
(b). Eate book „ 12.8
3. Total deaths of Eesidents.
(a). Mathematical population 14.3
(b). Eate book „ 13.5
4. Correct Death Eate.
Deaths of residents only registered during the year in the district,
plus deaths of residents that occurred outside the district in the same
time, calculated on the estimated population based on the number of
inhabited houses at the middle of the year, and the average number of
persons living in each house. According to this method the real
death-rate for 1905 is 13.5 per 1000.