“…For example, many datasets include individuals' residential location at birth or in early childhood, recollected by survey participants in adulthood or older age (e.g., the US National Longitudinal Survey of Youth 1979, the UK Biobank and Understanding Society, the German Socio-Economic Panel, the Dutch Lifelines cohort, and the Scottish Generation Scotland). These location data have in turn been used in a wide range of empirical applications, such as those studying geographic mobility 1,2 , geographic stratification and spatial correlation of genetic variation [3][4][5][6][7][8] , assortative mating and social homogamy 9,10 , but they have also been used to capture regional differences in infrastructure, health or economic circumstances, such as the staggered roll-out of policy 11 . Similarly, they have allowed researchers to include area of birth fixed effects to account for systematic differences between geographical areas 12,13 , and to merge in external information on (area-level) weather, health or socio-economic information [14][15][16][17][18][19][20][21] .…”