I am researcher based at the Asian Demographic Research Institute and IIASA. I am also a Professor in the School of Sociology and Political Science at Shanghai University.
Previously I worked at the Vienna Institute of Demography, the ESRC Centre for Population Change and S3RI at the University of Southampton.
My day-to-day research covers estimating migration and applying statistical methods to better forecast components of population change. This website contains posts mainly related to my research, including some information on my publications and use of R. The site is the successor to my WordPress blog which I had trouble accessing when in China.
PhD Social Statistics and Demography, 2009
University of Southampton
MSc Social Statistics (Distinction), 2005
University of Southampton
MSc Statistics (Distinction), 2003
University of Kent
Data on stocks and flows of international migration are necessary to understand migrant patterns and trends and to monitor and evaluate migration-relevant international development agendas. Many countries do not publish data on bilateral migration flows. At least six methods have been proposed recently to estimate bilateral migration flows between all origin-destination country pairs based on migrant stock data published by the World Bank and United Nations. We apply each of these methods to the latest available stock data to provide six estimates of five-year bilateral migration flows between 1990 and 2015. To assess the resulting estimates, we correlate estimates of six migration measures from each method with equivalent reported data where possible. Such systematic efforts at validation have largely been neglected thus far. We show that the correlation between the reported data and the estimates varies widely among different migration measures, over space, and over time. We find that the two methods using a closed demographic accounting approach perform consistently better than the four other estimation approaches.
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