The HPI concentrates on the deprivation in the three essential elements of human life already reflected in the HDI: longevity, knowledge and a decent standard of living.
The HPI is derived separately for developing countries (HPI-1) and a group of select high-income OECD countries (HPI-2) to better reflect socio-economic differences and also the widely different measures of deprivation in the two groups.
The Human Development Reports website summarizes this as "A composite index measuring deprivations in the three basic dimensions captured in the human development index—a long and healthy life, knowledge and a decent standard of living."
: Arithmetic average of 3 characteristics: The Human Development Reports website summarizes this as "A composite index measuring deprivations in the four basic dimensions captured in the human development index—a long and healthy life, knowledge and a decent standard of living—and also capturing social exclusion."
For information about the component values for countries other than the ones on the list, see source links below.