Median incomes below those levels are more comparable from year to year since they have always been calculated using linear interpolation. Thus, use caution when comparing median incomes above $12,000 for people or $18,000 for families and households for different years. All other estimates of median income and associated standard errors for 1976 through 2011 (2012 ASEC) and almost all of the estimates of median income and associated standard errors for 1975 and earlier were calculated using linear interpolation. This is because the width of the income interval containing the estimate is greater than $1,000.
We calculated estimates of median income and associated standard errors for 1976, 1977, and 1978 using Pareto interpolation if the estimate was larger than $12,000 for people or $18,000 for families and households. This is because the width of the income interval containing the estimate is greater than $2,500. The Census Bureau calculated estimates of median income and associated standard errors for 1979 through 1987 using Pareto interpolation if the estimate was larger than $20,000 for people or $40,000 for families and households.
Pareto interpolation assumes a decreasing density of population within an income interval, whereas linear interpolation assumes a constant density of population within an income interval. Currently, we are using linear interpolation to estimate all medians. The Census Bureau has computed medians using either Pareto interpolation or linear interpolation. The Census Bureau has changed the methodology for computing median income over time. Household data are collected as of March.Īs stated in the Census's Source and Accuracy of Estimates for Income, Poverty, and Health Insurance Coverage in the United States: 2011.Įstimation of Median Incomes. 2021 CPI-U-RS Adjusted Dollars, Not Seasonally Adjusted
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