 

Headcount (H):  % of population living in households with consumption or income per person below the poverty line. 

Survey year 
The "Survey year" is the year for which the income or consumption data were collected. 

Reference year  is year we choose to line up the data. The reference years currently available are 1981, 1984, 1987, 1990, 1993, 1996, 1999, 2002, 2005, 2008, 2010, 2011, 2012, 2013 and 2015. 

Mean$  The "Mean$" is $ the average monthly household per capita income or consumption expenditure from the survey in 2011 PPP. 

Median$  is the median of monthly household per capita income or consumption expenditure from the survey in 2011 PPP. 

PL  Poverty line in 2011 PPP per day. The default poverty line is $1.9 per day. 

PPP  refers to Purchasing Power Parity. The default option is the PPP exchange rates for household final consumption expenditure in 2011 in the World Development Indicators. 

Poverty Gap (PG): 
The mean shortfall of income from the poverty line.
The mean is based on the entire population treating the nonpoor as having a shortfall of zero, and the shortfall is expressed as a proportion of the poverty line.


Squared poverty gap (SPG): 
The mean squared shortfall of income from the poverty line.
The mean is based on the entire population treating the nonpoor as having a shortfall of zero, and the shortfall is expressed as a proportion of the poverty line (and then squared).


Watts' poverty index:  This is the mean across the population of the proportionate poverty gaps, as measured by the log of the ratio of the poverty line to income, where the mean is formed over the whole population, counting the nonpoor as having a zero poverty gap. 

Gini index:  a measure of inequality between 0 (everyone has the same income) and 100 (richest person has all the income) 

MLD index:  stands for the mean log deviation. This is an index of inequality, given by the mean across the population of the log of the overall mean divided by individual income. 

Spatial CPI: 
A price index that reflects differences in prices faced in different locations at the same date. 

Weighted national mean: 
The mean for the economy as a whole incorporating the statistical weights implied by the sample design to as to get an unbiased estimate of the population mean. 

Data Type: 
Type of welfare variable. Could either be income or consumption
 C: grouped consumption
 I: grouped income
 i: unitrecord income data with nonparametric analysis
 c: unitrecord consumption data with nonparametric analysis



