A number of terms are used in describing the individuals and families making up a household. To really understand household data, the analyst should become familiar with the terms below.
Household Reference Person - The person in whose name the house is owned or rented. If a married couple, then either the husband or wife may be designated the household reference person. The CPS keys all family relationship information to the household reference person, sometimes referred to as the Householder. ExpandedRelationship should be used to identify household reference persons, since HhFamilyRelation and DetailedHhFamilyRelation do not identify household reference persons in group quarters households.
Family Householder - The household reference person, if he or she has at least one relative by birth, marriage, or adoption living in the household.
Nonfamily Householder - The household reference person, if he or she has no relatives living in the household. Also referred to as a Primary Individual, or loosely as an Unrelated Individual.
Primary Family -The family containing the family householder, consisting of all persons related to the family householder by birth, marriage, or adoption. Related subfamilies (see below) may be included with or excluded from the primary family, as described in section II.
Related Subfamily - A married couple with or without children, or one parent with one or more own never married children under 18 years old, living in a household and related to, but not including, the household reference person or spouse. For example, a young married couple sharing the home of the husband=s or wife=s parents.
Unrelated Subfamily - A married couple with or without children, or one parent with one or more own never married children under 18 years old, that does not include anyone related to the household reference person or his or her relatives. For example, guests, roomers, boarders, or resident employees and their families living in the household. Prior to the March 1980 CPS, unrelated subfamilies were referred to as secondary families.
Unrelated Individual - A person who is not the household reference person and is not related to anyone else in the household. Some unrelated individuals are actually related to other people in the household, but (beginning with the March 1989 CPS) this relationship is not captured. Types of relationships among persons unrelated to the household reference person that are not reflected in the unrelated subfamily definition are lost. For example, if two brothers are living in a household, but are not related to the household reference person, the CPS does not indicate that they are related. Each brother would be counted as an unrelated individual. Prior to the March 1980 CPS, unrelated individuals were referred to as secondary individuals. Loosely applied, the term may include nonfamily householders.
Group Quarters - Noninstitutional living arrangements for groups not living in conventional housing units or groups living in housing units containing nine or more persons unrelated to the designated household reference person.
There are two basic definitions of family used in tabulating TRIM3 results: family with subfamilies included, and family with subfamilies separate.
Families with (Related) Subfamilies Included
This definition of family incorporates all related persons in the household into a single family. So a three generation family including grandparents, their adult daughter, and her child would be one family. Unrelated subfamilies are maintained as separate families.
Families with (Related) Subfamilies Separate
Under this definition, both related and unrelated subfamilies are counted as separate families. In the three generation example above, the adult daughter and her child would constitute a separate family.
Primary and Unrelated Individual Families
Although they are not technically families, in that they have no relatives, primary and unrelated individuals are always represented as separate families in TRIM3. The one exception to this rule is that TRIM3 does not permit unrelated children under the age of 15 to be in a family by themselves (prior to the March 1980 CPS, children aged 14 were permitted to be separate families, but those younger than 14 were not). In TRIM3, these children are merged into the family of the (family or nonfamily) householder.
The Census does not always include primary and unrelated individuals in its counts of families. Analysts should consider whether to include or exclude primary and unrelated individuals from their counts of families.
Family level data from the CPS is available in TRIM3, but should be used with extreme caution. The CPS (and TRIM3) stores separate family level information for each primary family, related subfamily, unrelated subfamily, primary individual, and unrelated individual. What is not always clear is whether the family level information stored for the primary family is based upon information that includes or excludes its related subfamilies. Similarly, it is not always clear whether the family level information stored with the related subfamily reflects the subfamily alone, or the primary family including all of its related subfamilies. Analysts using a family level variable should be certain of what family concept is reflected in the variable. We recommend avoiding this source of confusion by aggregating person level information to the family level, as described in sections IV and V.
The TRIM3 person variables FamiliesWithSubfamilies and FamiliesSubfamiliesSeparate indicate which family a person belongs to, under the two different definitions of family. These variables are found in the Identification/Weight category of the Person table in the TRIM3 database. Each value has four digits, in which the...
Below is an example of SAS code in which a person level extract has been made from TRIM3 using the view and export microdata tool, and the goal is to aggregate persons into families, and create summary tables describing the families. Note that the code uses the 8 character TRIM2 names suggested as SAS variable names by the TRIM3 export procedure.
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