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Research Methodology regression analysis economics population demography developing country population density labour migration Population Dynamics migration determinants Developing Countries Asia Middle East statistics economic aspect Western Asia Asia, Western Mediterranean Countries Arab Countries spatial distribution income Saudi Arabia geography health care manpower Health Manpower Socioeconomic Factors Africa socioeconomics Northern Africa theoretical model Models, Theoretical Article Inflation, Economic inflation Statistical Regression Labor Force--determinants Africa, Northern migration Geographic Factors data analysis Demographic Factors research Emigration and Immigration Economic Factors International Migration--determinants Transients and Migrants Human Resources Macroeconomic Factors employment theoretical studies Labor Migration--determinants Egypt