DEFINITIONS AND EXPLANATIONS

Except for the instances noted below, the concepts and definitions used in the quarterly surveys are identical with those used in the 1960 Census.

Standard metropolitan statistical area (SMSA).--Except in New England, an SMSA is a county or group of contiguous counties which contains at least one city of 50,000 inhabitants or more, or "twin cities" with a combined population of at least 50,000, the smaller of which must have at least 15,000. In addition to the county, or counties, containing such a city or cities, contiguous counties are included in an SMSA if, according to certain criteria, they are essentially metropolitan in character and are socially and economically integrated with the central city. In New England, SMSA's consist of towns and cities, rather than counties. A more detailed discussion of the criteria used to define SMSA's is given in 1960 Census of Housing, ume I, States and Small Areas.

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The statistics for inside SMSA's and outside SMSA's presented for the second quarters 1966 and 1965 relate to the areas (212) designated SMSA's at the time of the April 1960 Census. Prior to the second quarter 1962, the statistics related to the areas (168) designated SMA's at the time of the 1950 Census. For a list of the 212 SMSA's and their constituent parts, refer to the individual chapters (or Series HC(1) reports) in the 1960 Census of Housing, Volume I, States and Small Areas; or to the 1960 Census of Population, Volume I, Number of Inhabitants. For a list of the 168 areas and their constituent parts, refer to the individual chapters (or bulletins) in the 1950 Census of Housing, Volume I, General Characteristics; or to the 1950 Census of Population, Volume I, Number of Inhabitants, or Volume II, Characteristics of the Population, Part I, United States Summary.

Housing unit. --Beginning with the second quarter 1960, the 1960 Census housing unit concept was used to enumerate separate living quarters. Prior to that time, separate living quarters were enumerated according to the 1950 dwelling unit definition. The major difference between the two is not in content but in sharpening of the criteria by which separate units are identified. It is expected that the housing unit concept will yield better coverage of both occupied and vacant living quarters than the dwelling unit concept. Although no statistical measure of the effect of the change is available at this time, it is believed to be too small to affect the vacancy rates.

A group of rooms, or a single room is regarded as a housing unit when it is occupied as separate living quarters, that is, when the occupants do not live and eat with any other persons in the structure, and when there is either (1) direct access from the outside or through a common hall, or (2) a kitchen or cooking equipment for the exclusive use of the occupants.

Vacant living quarters which are intended for occupancy as separate living quarters and meet the physical criteria defined above are separate housing units. Since it is customary in some localities for occupants to furnish their own cooking equipment, vacant units without a kitchen or cooking equipment are considered to have such equipment if the last occupants had cooking equipment.

Living quarters of the following types are excluded from the housing unit inventory: dormitories, bunkhouses, and barracks; quarters in predominantly transient hotels, motels, and the like, except those occupied by persons who consider the hotel their usual place of residence; quarters

in institutions, general hospitals, and military installstions except those occupied by staff members or resident employees who have separate living arrangements.

Quarters for roomers or boarders having shared living arrangements are excluded from the housing inventory if there are five or more such rooms; they are combined as one housing unit if there are four or fewer such rooms. Trailers, tents, and boats are excluded if vacast. used for business, or used for extra sleeping space cr vacations.

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Dwelling unit, 1950.--The 1950 dwelling unit fined as follows: A group of rooms occupied as separate living quarters was a dwelling unit if it had separate cooking equipment or if it constituted the only living quarters in the structure. Each apartment in a regular apartment house was a dwelling unit even though it may not have had separate cooking equipment. Apartments in residential hotels were dwelling units if they had separate cooking equipment or consisted of two or more rooms.

Vacant quarters which were intended for occupancy as separate living quarters and met the physical criteria defined above were separate dwelling units. Vacant units were considered as having cooking equipment if they were equipped with such equipment or if the last occupants had cooking equipment.

In general, living quarters from the housing unit inventory dwelling unit inventory.

of the types excluded were excluded from the

Occupied housing units.--A housing unit is occupied if a person or group of persons was living in it at the time of enumeration or if the occupants were only temporarily absent, as for example, on vacation. The persons living in the unit must consider it their usual place of residence or have no usual place of residence elsewhere. The count of occupied housing units is the same as the count of households.

Units occupied by persons with usual residence elsewhere.--A housing unit which is occupied temporarily by persons who usually live elsewhere is enumerated as a vacant unit provided the usual place of residence is hell for the household and is not offered for rent or for sale. For example, a beach cottage occupied at the time of exmeration by a family which has a usual place of residence in the city is included in the count of vacant units. Their house in the city would be reported "occupied" would be included in the count of occupied units since the occupants are only temporarily absent.

Units occupied by persons with usual residence elsewhere are included with seasonal units or with year-round vacant units as dilapidated, or not dilapidated but hela off the market, as the case may be.

Vacant housing units.--A housing unit (furnished or unfurnished) is vacant if no persons were living in it at the time of enumeration, except when its occupants were only temporarily absent. Dilapidated vacant units were included if they were intended for occupancy as living quarters; however, if the vacant unit was unfit for use and beyond repair so that it was no longer considered living quarters, it was excluded from the inventory. Vacant units to be demolished were excluded if unfit or if there was positive evidence, such as a sign or mark on the house or in the block, that the unit was to be torn down. New

hits not yet occupied were enumerated as vacant housing its if construction had proceeded to the point that all he exterior windows and doors were installed and final sable floors were in place; otherwise, potential units nder construction were not included. Unoccupied units eld off the market for various reasons and units recently ented or sold but not yet occupied are considered vacant. Vacant sleeping rooms in lodginghouses, transient ccommodations, barracks, and other quarters not defined s housing units are not included in the statistics in his report. (See section on "Housing unit.")

Year-round vacant units.--Year-round units are those ntended for occupancy at any time of the year, even though hey may not be in use the year round. In resort areas, a ousing unit which is usually occupied on a year-round asis was considered a year-round unit. On the other and, a housing unit located in the closely built-up area f a nonresort city was considered a "year round" unit ven though it may be occupied only part of the year. As ndicated above, year-round units temporarily occupied by ersons with usual residence elsewhere are included with ear-round vacant units.

which have been rented or sold but the new renters or owners have not moved in as of the day of enumeration. In the 1950 statistics, such units are shown in combination with year-round not dilapidated vacant units held off the market.

Vacant units held off the market. -- Included in this category are year-round units in sound or deteriorating condition which were vacant for reasons other than those mentioned above: for example, held for occupancy of a caretaker, janitor, and the like; held for settlement of estate; held for personal reasons of the owner; and temporarily occupied by persons who have a usual place of residence elsewhere. In the 1950 statistics, such units are shown in combination with year-round not dilapidated vacant units, rented or sold, as "nonseasonal not dilapidated, not for rent or sale" units.

Sound housing has no defects, or only slight defects which are normally corrected during the course of regular maintenance. Examples of slight defects include: lack of paint; slight damage to porch or steps; small cracks in walls, plaster, or chimney; broken gutters or downspouts; slight wear on floors or doorsills.

Deteriorating housing needs more repair than would be provided in the course of regular maintenance. It has one or more defects of an intermediate nature that must be corrected if the unit is to continue to provide safe and adequate shelter. Examples of such defects include: shaky or unsafe porch or steps; holes, open cracks or missing