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urban population education Research Methodology Comparative Studies leisure Americas economics Migrants population demography developing country Population Dynamics motivation Research Report Developing Countries Schools statistics Social Problems Statistical Studies comparative study Developed Countries housing Environment economic conditions Residence Characteristics quality of life spatial distribution United States North America Migration--determinants psychology geography health services research Health Services Evaluation social problem Psychological Factors Multivariate Analysis Behavior Western Hemisphere social welfare school Article organization and management Organization And Administration Programs program evaluation Transportation traffic and transport migration health care quality Geographic Factors developed country population and population related phenomena data analysis Quality of Health Care Leisure Activities research Demographic Factors Emigration and Immigration Economic Factors Northern America Transients and Migrants Population Characteristics Macroeconomic Factors crime