in order to carry out this calculation the indigence line is multiplied by a factor that differs for urban and rural areas for poverty estimates up until a factor of was used for urban zones and a factor of was used for rural areasathe factors applied since vary depending on the differentials between trends in the prices for foodstuffs and for other goods and services since the indigence line is updated on the basis of the cpi for food products while the portion of the poverty line corresponding to expenditure on nonfood goods is updated using the nonfood cpi in line with standard eclac practice the data have been corrected to account for the nonresponse rate for some incomerelated questions from wage earners the selfemployed and retirees and to mitigate probable underreporting biases this latter operation is carried out by comparing the responses to incomerelated questions in the survey with estimates based on the household income and expenditure accounts included in each countrys application of the system of national accounts these estimates are calculated using official information