NTA-NET (UGC-NET) Geography (80) Population Geography-Population Composition and Characteristics: Age, Sex, Rural-Urban, Occupational Structure and Educational Levels Study Material (Page 1 of 2)
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Demographic Attributes: Age-Sex Pyramid- Types of Population Pyramid, Factors Affecting Shape of Pyramid
Introduction
Population composition includes spatial variations of age, sex, marital status, occupation, nationality, language, family size, and religion. It is depicted by population pyramids. For example, the age-sex pyramid.
Age-Sex Pyramid
Bar graph depicts age and sex distribution of population called as age-sex pyramid. It has two back-to-back bar graphs, with population plotted on the X-axis and age on the Y-axis, one showing the number of males and one showing females in a certain population in five-year age groups (also called cohorts) . Males are shown on the left and females on the right, and they are measured by raw number or as percent of total population.
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Demographic Attributes: Sex Composition- Types of Sex Ratio, Factors Affecting Sex Ratio
Sex Composition
It is generally depicted by number of males per 1000 females or vice versa. If is female population, is male population and is total population then sex ratio can be represented as:
- For example, in Russia it is defined as or .
- For example, in USA it is defined as, .
- For example, in India and New Zealand it is defined as,
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