Statistical analysis of the depopulation verified between 1862 and 1970, according to different altitude strata, in the hydrographic basins of the Aroma and Tarapacá streams.

Abstract

By means of the information gathered through the study of the population censuses of the years 1862; 1876; 1895; 1907; 1920; 1930; 1940; 1940; 1952; 1960 and 1970, the trend followed by the decrease in the number of inhabitants belonging to the hydrographic basins of the Aroma and Tarapacá ravines (1st Region, Chile) was analyzed. With the use of statistical techniques, including Analysis of Variance and Regression Analysis, three well-defined periods, different from each other, were found to exist for the period of time studied. The behavior of the population, in terms of its decrease according to different altitude strata, showed statistically three different groups, among which it was striking that the strata corresponding to the altitude between 2,500 - 3,000 m. and 3,000 - 3,500 m. were the most affected by depopulation.