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The Foster–Greer–Thorbecke indices are a family of poverty metrics.The most commonly used index from the family, FGT 2, puts higher weight on the poverty of the poorest individuals, making it a combined measure of poverty and income inequality and a popular choice within development economics.
According to World Bank, "Poverty headcount ratio at a defined value a day is the percentage of the population living on less than that value a day at 2017 purchasing power adjusted prices. As a result of revisions in PPP exchange rates, poverty rates for individual countries cannot be compared with poverty rates reported in earlier editions."
Head count ratio in South Africa. The head count ratio (HCR) is the population proportion that exists, or lives, below the poverty threshold. [1] One of the undesirable features of the head count ratio is that it ignores the depth of poverty; if the poor become poorer, the head count index does not change. [2]
The most common method measuring and reporting poverty is the headcount ratio, given as the percentage of the population that is below the poverty line. For example, The New York Times in July 2012 reported the poverty headcount ratio as 11.1% of American population in 1973, 15.2% in 1983, and 11.3% in 2000. [ 6 ]
The depth of poverty is the average 'gap' (G) between the level of deprivation poor people experience and the poverty cut-off line. M1 = H x A x G. Adjusted Squared Poverty Gap (M2): This measure reflects the incidence, intensity, and depth of poverty, as well as inequality among the poor (captured by the squared gap, S). M2 = H x A x S.
Poverty headcount ratio at $1.90 a day (2011 PPP) (% of population). Based on World Bank data ranging from 1998 to 2018. [11 Absolute poverty, often ...
Poverty headcount ratio at $1.90 a day (2011 PPP) (% of population). Based on World Bank data ranging from 1998 to 2018. [16] To assist in measuring this, the World Bank has a daily per capita international poverty line (IPL), a global absolute minimum, of $2.15 a day as of September 2022. [17]
A third "symmetrized" Theil index (Theil-S) is the arithmetic average of the two previous indices. The formula of the third Theil index has some similarity with the Hoover index (as explained in the related articles). As in case of the Hoover index, the symmetrized Theil index does not change when swapping the incomes with the income earners.