We can measure coverage of a particular opportunity by the percentage of people that have access to it. For example, if there is a population of 100 people and 75 of them have access to water, then there is an overall coverage rate of 75 percent. For calculating the HOI, we consider inequalities in these opportunities and average them in order to penalize the overall coverage rate. For example, in the case in which all possible groups have the same access this penalization is zero. If one group has full access while another has null access, the penalization drives the HOI to a much lower value than its coverage.
The HOI was proposed by Paes de Barros et al. (2008) and is an adaptation of the welfare function suggested by Amartya Sen (1976). In particular, this index takes into account the average coverage of a certain service and the inequality of its distribution. It follows the same logic as GDP per capita and inequality indicators in Sen's welfare function. An increase in the index can be associated to either an increase in coverage or to a more equitable distribution of that service.
Since the numbers presented here are based on SEDLAC (a regional data harmonization effort that increases cross-country comparability) they may differ from official statistics reported by governments and national statistical offices. The nearest year is used for countries in which data are not available in a particular year. For most opportunities, coverage and HOI are calculated for children between the ages of 0 and 16. For 'school attendance' these indicators are calculated for children between the ages of 10 to 14 years, and for ‘finished primary school’, 12 to 16 years.
Decomposition of the changes in the HOI
The change in the HOI between two selected years can be decomposable into the composition effect (due to changes in the distribution of circumstances), and the coverage effect (the contribution of changes in the coverage rates of different circumstance groups). The latter may also be decomposable into the scale effect (capturing the impact of proportional change in the coverage rates for all circumstance groups) and the equalization effect (capturing improvements in the coverage rates specifically for groups with below-average coverage rates relative to groups with above-average coverage rates).
Source: Molinas, J., R. Paes de Barro, J. Saavedra and M. Giugale. 2012. "Do Our Children Have a Chance?" The 2010 Human Opportunity Report for Latin America and the Caribbean.
Washington, DC: World Bank.
For more information on the calculation of HOI, click here.
The SEDLAC (CEDLAS and WB) harmonization is an effort to increase cross-country comparability. However, methodological changes in the underlying surveys may result in non-comparable data that the harmonization process cannot fully solve. It is important that the user know what data is and is not comparable. For more information, visit the comparability dashboard.
