Service Provided Via:	IAAIS Formula	Notes:
Individual radios tuned to a secondary FM signal (SCA)	1 person per address	Receiver needed. Often more than one person at an address uses a receiver. See Group Homes
Individual radios in a common room at a Nursing Home or Group Home, Long-Term Care Facility, Low-vision Clinic, Senior Center or School	Poll facility twice yearly to define how many eligible # of individuals who live in or frequent each facility	It doesn’t matter whether an individual at a facility is actually listening. The numbers should include how many can listen and are eligible on any given day. This can be captured on an institutional application form or survey that requests specific information
Hospital signal provided to individual beds in via Hospital TV Rental or other method	# of Licensed Beds	This figure is usually less than the number of beds in the facility and is used by other organizations as a legitimate statistic
Retirement complexes that distribute service to each apartment or residence	#Number of Residential Units	Use their figures
Internet Sites with registration	# of registrants on the website
Internet Streams with open service	# of “hits” of internet users of the site.
Telephone Systems	# of registrants to the service
Cable SAP	1 person per address	Receiver needed
Open Cable	We recommend using percentages from Lighthouse International, Inc. applied to U.S. Census data for each broadcast area served	Home penetration, a common newspaper term, could be used to represent every cable subscriber household as stated by the company or municipality. Get “qualified” number of listeners by applying Census counts to actual subscriber total, then applying Lighthouse stats. See: http://www.lighthouse.org/research_statistics.htm
Open Radio/SAP	Use Census and Lighthouse stats	Apply stats to entire population in service area
Potential Listeners	Use Census stats, Lighthouse stats and any local stats available.	Many stations use figures for VI seniors as example (As baby-boomers age, the potential for qualified listeners grows in tandem)