A comparison of the income distributions of families with head 65 years old and over for the United States from the 1960 Census and from the March 1960 CPS is shown in table A. The CPS distribution excludes families for which complete income information was not reported, whereas the census distribution includes nonrespondents, with their income estimated on the basis of known demographic, social, and economic characteristics.
Table A. Percent Distribution of Families with Head 65 Years Old and Over, By Family Income in 1959, According To 1960 Census and To March 1960 Current Population Survey
||Percentage point difference
|$3,000 to $4,999
|$5,000 to $6,999
|$7,000 to $9,999
|$10,000 and over
The differences at the extremes of the distributions as shown above are larger than would be expected from the standpoint of Sampling Variability. A number of studies are now being made which may help in explaining these differences, including, for example, a study of matched questionnaires for persons who were enumerated in both the March 1960 CPS and the 1960 Census.