of the largest LGBT populations per capita. It ranks fifth of all major cities in the country (behind San Francisco, and slightly behind Seattle, Atlanta, and Minneapolis respectively), with 12.3% of the city identifying as gay, lesbian, or bisexual. Higher education A long established center of higher education, the area includes many community colleges, two-year schools, and internationally prominent undergraduate and graduate institutions. The graduate schools include highly regarded schools of law, medicine, business, technology, international relations, public health, education, and religion. Greater Boston contains seven R1 Research Institutions as per the Carnegie Classification of Institutions of Higher Education. This is, by far, the highest number of such institutions in a single Metropolitan Statistical Area in the United States. Selected statistics Changes in house prices for the Greater Boston area are publicly tracked on a regular basis using the Case–Shiller index; the statistic is published by Standard & Poor's and is also a component of S&P's 10-city composite index of the value of the residential real estate market. Major companies References: Companies along, inside or outside I-495, outside Route 128 Abbott Laboratories, in Worcester (pharmaceutical laboratory) Advanced Cell Technology, in Worcester (research laboratory) AMD, in Boxborough Analog Devices, in Norwood Atlantic Broadband, in Quincy Atlantic Tele-Network, in Beverly Avid Technology, Inc, in Burlington (headquarters) Azimuth Systems, in Acton Bain & Company, in Boston (headquarters) Bain Capital, in Boston (headquarters) Bertucci's Corporation, in Northborough (headquarters) BJ's Wholesale Club, Inc., in Westborough (headquarters) Bose Corporation, in Framingham (headquarters) Boston Properties, Inc., in Boston (headquarters) Boston Scientific Corporation, in Marlborough (headquarters) Charles River Laboratories, in Wilmington (headquarters) Cisco Systems, in Boxborough CommunityRoot, in Boston (headquarters) David Clark Company, in Worcester (manufacturer of space suits) Diebold, in Marlborough (regional headquarters) Dell Technologies, in Hopkinton (headquarters) Evergreen Solar, in Marlborough (headquarters) Hewlett-Packard, in Marlborough (regional headquarters) Schneider Electric, in Andover, Massachusetts HourlyNerd, in Boston Innerscope Research, in Boston (headquarters) Intel Corporation, in Hudson Kronos Incorporated, in Chelmsford, Massachusetts (headquarters) Marshalls, Inc, in Framingham (headquarters) The MathWorks, in Natick MITRE Corporation, in Bedford (headquarters) Morgan Construction Company, in Worcester (rolling steel mill technology) National Amusements, in Norwood (headquarters) Novartis, in Cambridge (US headquarters) Philips Electronics North America, in Andover (regional headquarters) Philips Healthcare, in Andover (global headquarters) and Framingham Red Hat, in Westford (engineering headquarters) Reed & Barton in Taunton (factory and headquarters) Saint-Gobain, in Worcester Sepracor, Inc., in Marlborough (headquarters) Staples, Inc., in Framingham (headquarters)