This is the world population data, revision 2010, by countries used in the paper
Nagy et al. (2016) tools:::Rd_expr_doi("10.1080/10618600.2017.1336445") and Dai et al. (2020)
tools:::Rd_expr_doi("10.1016/j.csda.2020.106960"). It contains population (both sexes) of countries
as of July 1 in the years 1950 - 2010. The data have been pre-processed as described
in Nagy et al. (2016) and hence contains only the 105 countries with population
in the range of one million and fifteen million on July 1, 1980.