A widely used poverty indicator is the $1 a day poor, which refers to income, or consumption poverty that is comparable across countries and can be used to analyse regional and gjobal poverty trends. For calculating $1 a day poor, nationally representative household survey data are used to generate per capita consumption or income aggregates in constant PPP $ for each household in a country for a given year. These aggregates are then weighted by the size of the household and the number of people each household represents, from survey sample weights, to generate a distribution of individual consumption or income for the country. Aparame trie specification of the underlying Lorenz curve is then fitted for the distribution.