“…In the case of the latter, when the survey is not available upfront one may consult the balance of payment statistics (BOP). As a rule of thumb, remittances obtained from the BOP equal 1.5 times those obtained from the household survey, with a correlation of .90 (Acosta, Calderon Fajnzylber and Lopez, 2006a). Nevertheless, a given country may be an outlier, so one may check also with other sources, for example a comprehensive estimate of bilateral stocks of migrants for 226 countries and territories compiled by Global Trade Analysis Project (GTAP, 2005), the OECD's Database on Immigrants and Expatriates (OECD, 2005) containing detailed information on the foreign-born population for almost all member countries of the OECD, the Docquier and Marfouk (2004) as well as Beine, Docquier and Rapoport (2006) databases on migration by education (and age of entry) from developing countries to OECD countries or Bhargava and Docquier (2006) Database on the International Migration of Physicians.…”