• International poverty line in local currency is the international
poverty lines of $1.25 and $2.00 a day in 2005 prices, converted
to local currency using the PPP conversion factors estimated by
the International Comparison Program. • Survey year is the year in
which the underlying data were collected or, when the data collection
period bridged two calendar years, the year in which most of the data
were collected. • Population below $1.25 a day and population
below $2 a day are the percentages of the population living on less
than $1.25 a day and $2 a day at 2005 international prices. As a
result of revisions in PPP exchange rates, consumer price indexes,
or welfare aggregates, poverty rates for individual countries cannot
be compared with poverty rates reported in earlier editions. The
PovcalNet online database and tool (http://iresearch.worldbank.
org/PovcalNet) always contain the most recent full time series of
comparable country data. • Poverty gap is the mean shortfall from
the poverty line (counting the nonpoor as having zero shortfall),
expressed as a percentage of the poverty line. This measure reflects
the depth of poverty as well as its incidence.