The equivalent measure used here assigns a weight of 1.0 to all persons over 15, and 0.5 for those under age 15. More information is available at http://pwt.econ.upenn.edu/Documentation/append61.pdf.
For proper citation, see http://pwt.econ.upenn.edu/php_site/pwt_index.php
Source Indicator: rgdpeqa
Source: University of Pennsylvania
Release: Penn World Table 7.1
University of Pennsylvania, Purchasing Power Parity Converted GDP Chain per equivalent adult for Sao Tome and Principe [RGDPEQSTA626NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/RGDPEQSTA626NUPN/, June 2, 2015.