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2-4 Unit. A housing unit in a structure containing 2, 3, or 4 units.

5+ Units. A housing unit in a structure containing 5 or more units.

55+ Household Sample. Part of the Newly Moved-in Household Sample limited to households with at least one member aged 55 and over and the absence of persons below 19 and K to 12th grade students.

American Community Survey (ACS). An ongoing survey taken each year by the Census Bureau. It provides 1-year, 3-year, and 5-year estimates of demographic, housing, social, and economic information.
Bedroom. The room in a housing unit designed to be used as bedroom; a one-room unit such as studio, efficiency, or in-law apartment is considered as having no bedroom.

Condominium Sample. A sample consists of owner-occupied units involving condo fees. The attribute of a condominium is not pertaining to housing structure, but rather to the legal form of ownership.

Household Income. The income in the past 12 months of all household members 16 years and over who resided in the housing unit at the time of the survey. The figure in this report is adjusted to 2014 dollars.

Housing Configuration. A housing type defined by multiple attributes including dwelling type, the number of units in the structure, and bedroom numbers. CDA only reports common housing configurations because reliable ratios cannot be derived from a housing type that is rarely built.

Housing Unit. May be a house, an apartment, a single room, or other separate living quarters, excluding group quarters. All CDA ratios are calculated excluding vacant units, mobile homes, boats, RVs, vans, houseboats, railroad cars, etc.

Insufficient Sample Size. CDA planning ratios are based on sample estimates and the likelihood they represent the true value depends on the sample size. CDA considers a ratio unreliable if the number of unweighted observations falls below 25. CDA will report an estimate from using information from the PUMA and a larger geographical area.

Low and Moderate Household Sample. A sample of households whose income is below 80 percent of the median household income of the same household size.

Multifamily Unit. Housing units in a structure of 2 or more units, not classified as a single-family house.

Newly Moved-In Household Sample. A sample of households in which the householder moved into the unit no more than four years prior to the survey, (i.e., between 2006 and 2014).

Non-Public School Students. Persons who attend private school or private college or receiving home schooling.

Owner-Occupied Unit. A housing unit occupied by an owner even if it is mortgaged or not fully paid for.

Public School Attendees (PSA). Students in public school between kindergarten and grade 12. PSA is precise in the grade level; this is not the exact equivalent of the SAC because PSA includes students who are older than 17.

Public Transit. Means of transportation including bus, trolley bus, streetcar, trolley car, subway, elevated rail, railroad, or ferryboat.

Public Use Microdata Area (PUMA). Geographic unit demarcating at least 100,000 people used by the US Census for providing information for persons, households, and housing units.

Public Use Microdata Sample (PUMS). A sample that contains records about individual people and housing units.

Recently Built Unit Sample. A sample drawn from the PUMS data using the criterion of occupied housing units that were first built between 2005 and 2014.

Renter-Occupied Unit. A housing unit occupied by renters who may rent the unit for cash or for other kinds of payment.

School-Age Children (SAC). Persons who are between 5 and 17 years of age. SAC includes those attending public, private or other types of school, who are home schooled, who may be working, have dropped out of school, or who are attending college but living at home. If the SAC is differentiated by grade group, the groups are approximated by age, not by actual grade attendance.

Single Family Attached. An occupied one-family house that has one or more walls extending from ground to roof separating it from adjoining structures. Single Family Attached housing includes row house, townhouse, townhome, twin house, duplex, and apartment and condominium units.

Single Family Detached. An occupied one-family house detached from any other houses that is with open space on all four sides, not including adjoining sheds or garages.

Studio. A unit without a designated bedroom or the living and sleeping space are not separated; also known as efficiency unit or in-law apartment.

Transit Commuter Household Sample. A sample of households with at least one worker uses public transit as primary transportation to work.
Vehicles Available. Number of vehicles available for the household members, including passenger cars, vans, and pickup or panel trucks of one ton or less.

Workers Drive to Work. Workers 16 or older who do not work at home and travel to work by car, truck, or van.

Workers Use Public Transit. Workers 16 or older who do not work at home and use public transit as a means of transportation to work.