- Modification of the "inc_q" data
The methodology to calculate within-country income quintiles changed since 2011. Instead of basing the within-country income quintiles on household income data alone, additional data on household headcount are used. The finer granularity allows a more precise mapping of the income data into the within-country income quintiles. Weights are used to make the mapping nationally representative to the income structure of the country. The new method was retroactively applied to the 2011 data. All observations in "inc_q" are affected.