Practical preventive medicine . 51 equals , which is the log of80,750, the 1904 population. Each of these methods is best adapted to populations pre-senting certain characteristics. The geometrical is best adaptedto populations whose increase is due to the excess of births overdeaths, while the arithmetical is best adapted to areas wheregrowth is largely due to immigration. The latter is considered STATISTICS OF POPULATION 307 best adapted for use in the United States. It is to be noted withthese two methods, that in intercensal years the geometricalmethod will give results less than the
Practical preventive medicine . 51 equals , which is the log of80,750, the 1904 population. Each of these methods is best adapted to populations pre-senting certain characteristics. The geometrical is best adaptedto populations whose increase is due to the excess of births overdeaths, while the arithmetical is best adapted to areas wheregrowth is largely due to immigration. The latter is considered STATISTICS OF POPULATION 307 best adapted for use in the United States. It is to be noted withthese two methods, that in intercensal years the geometricalmethod will give results less than the arithmetical, but forpostcensal years its results will be greater. Where long time estimates are required, such as are requiredfor planning the scope of public improvement for a long termof years, neither of these are reliable. It is better to comparethe area with the development of other similar areas but oflarger population, subsequent to the time when their popula-tions were the same as that of the area under I I Less than 50 per cent Mai to g%% •• ^^ •• 1 I •• •• £SH1 At least 60 per cent Male Fig. 124.—Per cent, male in total population for states and territories, 1900(Bull. 14. Bur. Census.) These methods are not always applicable, as for example,where a population shows stationary indications or has evendeclined at the last census. Less accurate methods of estima-tion only are available and these unfortunately are of no valuein vital statistics. Thus we may estimate the populationfrom the ratio of persons per dwelling, if the number of thelatter are known. For the United States as a whole this is dwelling is defined as any building or set of rooms housinga family. Or the number of school children or trolley passengersmay furnish a rough guide. 4. The commonest data tabulated from census returns rela-tive to the composition of the population relates to sex, age, race 3o8 PRACT
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectprevent, bookyear1920
