... Missingvalues of the summands were imputed by taking intoaccount age, gender, years of education, employmentstatus and the number of persons living in the house-hold. About 20% of the individuals ... the sum of the respondent’ s own earned income, earned income of other persons living in the household, social securityincome, government assistance and other sources of income such as investments, ... dichotomizing sociodemo-graphic variables resulted in a loss of information on the one hand which is offset by an increase in reliability o n the other [19].Household income was calculated as the...