Data Dictionary:  Census 1960 Tracts Only Set 
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Survey: Census 1960 Tracts Only Set
Data Source:  Social Explorer & U.S. Census Bureau  DUALabs 
Data set: Social Explorer Tables (SE)
Table:  T135. Rooms In Unit (From 100% sample) [9] 
Universe: Occupied and Vacant Housing Units
Table Details
T135.  Rooms In Unit (From 100% sample)  
Universe: Occupied and Vacant Housing Units  

Relevant Documentation:
Excerpt from:  Social Explorer; U.S. Census Bureau; U.S. Censuses of Population and Housing: 1960. Census Tracts. Final Report PHC(1)11. U.S. Government Printing Office, Washington, D.C., 1962. 
Census Tract Data, 19401970: Elizabeth Mullen Bogue File > Census Tracts > Housing Characteristics > Rooms 
The number of rooms is the count of whole rooms used for living purposes, such as living rooms, dining rooms, bedrooms, kitchens, finished attic or basement rooms, recreation rooms, lodgers rooms, and rooms used for offices by a person living in the unit. Not counted as rooms are bathrooms; halls, foyers, or vestibules; closets; alcoves; pantries; strip or pullman kitchens; laundry or furnace rooms; unfinished attics, basements, and other space used for storage.
In the computation of the median number of rooms, a continuous distribution was assumed, with the whole number of rooms as the midpoint of the class interval. For example, when the median was in the 3room group, the lower and upper limits were assumed to be 2.5 and 3.5 rooms, respectively. The median was computed on the basis of the tabulation groups shown in the table. If the median falls in the category 8 rooms or more, it is shown in the table as 7.5+ rooms.
In the computation of the median number of rooms, a continuous distribution was assumed, with the whole number of rooms as the midpoint of the class interval. For example, when the median was in the 3room group, the lower and upper limits were assumed to be 2.5 and 3.5 rooms, respectively. The median was computed on the basis of the tabulation groups shown in the table. If the median falls in the category 8 rooms or more, it is shown in the table as 7.5+ rooms.
Excerpt from:  Social Explorer; U.S. Census Bureau; U.S. Censuses of Population and Housing: 1960. Census Tracts. Final Report PHC(1)11. U.S. Government Printing Office, Washington, D.C., 1962. 
Census Tract Data, 19401970: Elizabeth Mullen Bogue File > Census Tracts > Housing Characteristics > Units in structure 
A structure is defined as a separate building that either has open space on all four sides, or is separated from other structures by dividing walls that extend from ground to roof.
Statistics are presented in terms of the number of housing units rather than the number of residential structures. However, the number of structures for the first two categories may be derived. For 1unit structures (which include trailers), the number of housing units and the number of structures are the same. For 2 unit structures, the number of housing units is twice the number of structures. For the remaining categories, the number of structures cannot be derived from the data as tabulated.
The categories for number of housing units in the structure in 1960 are not directly comparable with those in 1950, particularly for 1 and 2unit structures. In the 1950 tract report, units in detached or attached structures were shown separately but those in semidetached structures containing 1 or 2 units were combined into one category. Comparability between 1950 and 1960 data may else be affected by the change in concept from dwelling unit to housing unit.
Statistics are presented in terms of the number of housing units rather than the number of residential structures. However, the number of structures for the first two categories may be derived. For 1unit structures (which include trailers), the number of housing units and the number of structures are the same. For 2 unit structures, the number of housing units is twice the number of structures. For the remaining categories, the number of structures cannot be derived from the data as tabulated.
The categories for number of housing units in the structure in 1960 are not directly comparable with those in 1950, particularly for 1 and 2unit structures. In the 1950 tract report, units in detached or attached structures were shown separately but those in semidetached structures containing 1 or 2 units were combined into one category. Comparability between 1950 and 1960 data may else be affected by the change in concept from dwelling unit to housing unit.