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Topic: Microdata

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	Public Use Microdata Sample, 1980 (Site not responding. Last check: 2007-11-03)
		Microdata samples include only a small fraction of the population, drastically limiting the chance that the record of a given individual is even contained in a microdata file, much less identifiable.
		Microdata samples will be useful to users (1) who are doing research that does not require the identification of specific small geographic areas or detailed cross tabulations for small populations, and (2) who have access to programming and computer time needed to process the samples.
		Microdata users frequently study relationships among census variables not shown in existing census tabulations, or concentrate on the characteristics of certain specially defined populations, such as unemployed homeowners or families with four or more children.
	wonder.cdc.gov /wonder/sci_data/census/pums/type_txt/pums80.asp (12585 words)

	Census 2000 Microdata
		Microdata are the individual records that contain information collected about each person and housing unit.
		Microdata samples are useful to users who are doing research that does not require the identification of specific small geographic areas or detailed cross tabulations for small populations.
		Use microdata to study relationships among census variables not shown in existing census tabulations.
	www.columbia.edu /acis/eds/census2k/microdata.html?print (1467 words)

	Texas Public Use Microdata Sample (PUMS)
		Public use microdata samples are extracts from the confidential microdata taken in a manner that avoids disclosure of information about households or individuals.
		The 1% Public Use Microdata Sample Equivalency (PUMEQ1) file is intended to help users understand the relationships between standard Census 2000 geographic concepts (counties, county subdivisions, places, and census tracts) and the SuperPUMA geographic units of the 1% PUMS data files.
		The 5% Public Use Microdata Sample Equivalency (PUMEQ5) file is intended to help users understand the relationships between standard Census 2000 geographic concepts (counties, county subdivisions, places, and census tracts) and the SuperPUMA and PUMA geographic units of the 5% PUMS data files.
	txsdc.utsa.edu /txdata/pums (895 words)

	Home Page: Guide to Microdata/PUMS
		Microdata are mostly original data that contains every individual (e.g., person, company, etc.) record in the survey/research samples.
		The size of microdata is usually too huge to be available in print, thus computerized data storage and retrieval systems, as well as issues of file formats associated with various statistical software and operating systems, are heavily involved in working with microdata.
		The guide is a gateway to microdata resources, which is intended to facilitate users in acquiring and using microdata of their interests, and also to serve as a reference tool for librarians who work in data services.
	www.library.uiuc.edu /doc/newpages/microdata/home1.htm (298 words)

	What is the IPUMS? (Site not responding. Last check: 2007-11-03)
		The flexibility offered by microdata is particularly important for historical research because the aggregate tabulations produced by the Census Bureau are often not comparable across time, and until recently the subject coverage of census publications was limited.
		For the period since 1940 census microdata are subject to strict confidentiality measures that limit their usefulness for some applications.
		The Integrated Public Use Microdata Series consists of a series of compatible-format individual-level representative samples of the United States for the years 1850, 1860, 1870, 1880, 1900, 1910, 1920, 1940, 1950, 1960, 1970, 1980, 1990, and 2000.
	www.ipums.umn.edu /usa/intro.html (5616 words)

	The IPUMS International Project: Preserving and Disseminating Census Microdata (Site not responding. Last check: 2007-11-03)
		Identify and preserve endangered census microdata and documentation.
		For example, the entire microdata archive of the U.N. Centro Latinoamericano de Demografía, some 8,000 computer tapes, will be salvaged and transferred to CDROM or other stable media.
		Integrate census microdata of some dozen countries from the earliest date available (usually the 1960s) through 2000.
	www.hist.umn.edu /~rmccaa/IPUMSI/overview.htm (261 words)

	IPUMS International Data License
		These microdata are provided for the exclusive purposes of teaching, academic research and publishing, and may not be used for any other purposes without the explicit written consent, in advance, of the corresponding national political authorities listed above.
		Users are prohibited from using microdata acquired from the Integrated Public Use Microdata Series International or other authorized distributors in the pursuit of any commercial or income-generating venture either privately, or otherwise.
		cite Integrated Public Use Microdata Series International and the corresponding national political authority(ies) as the source of the microdata, and to indicate that the results and views expressed are those of the author/user.
	www.hist.umn.edu /~rmccaa/IPUMSI/license.htm (693 words)

	Macro- and Microdata Analyses and Their Integration
		In principle, the data contained in these new microdata sources should be consistent with the macrodata in the national accounts.
		For example, in national accounting data, the interest received by the household sector as personal income is computed as a residual from that of other sectors, whereas in microdata the household provides a direct estimate of interest received.
		The idea of statistical matching is to combine microdata files which are complementary in terms of the variables they contain or the parts of the distribution that they sample.
	www.econ.yale.edu /news/ruggles/macro.htm (2334 words)

	Microdata - Privacy
		Microdata Corporation has a number of technological and operational security functions in place to protect the confidentiality of personal information to the maximum extent possible under current technological constraint.
		When you visit the Microdata Corporation site, your computer may be sent a "cookie," a small file that resides on your computer's hard drive.
		We may send you e-mail to notify you about future events, offers, updates, features or items which we feel may be of interest to you; this will be sent to the e-mail address which you have provided.
	microdata-corporation.com /html/privacy.html (337 words)

	1991 Census microdata files for schools
		Microdata files are unique in that they give users access to unaggregated data.
		These Canada and province microdata files were extracted from the 1991 Census individual file containing over 800,000 records.
		Information on the complete 1991 Public use microdata file was published in catalogue number 95M0007GPE, which you may find in a university library.
	www.statcan.ca /english/kits/pumf91/intropages.htm (280 words)

	MicroData Privacy Policy
		When you download software or reference material, subscribe to a newsletter, or contact us for support, we may require your contact or billing information which is used for internal operations and/or to provide you with updated information on our services.
		MicroData clients and guests may subscribe to a number of MicroData e-mail-based newsletters.
		Subscribing to the MicroData Newsletter: When you sign up for the MicroData Newsletter, your e-mail address is not used for any purpose other than to send you the newsletter on a periodic basis.
	www.microdata.com /privacy.htm (627 words)

	Sources of Microdata
		If you are not centain about what kind of microdata you are looking for, or you are not sure about the data availability, or you just want to get a general sense of what microdata is like, then this category would be a good starting point.
		Microdata files were first released for the 1981 Census, containing individual, family, and household information with a hierarchical structure for a 1 percent sample sample of households.
		Public use microdata files from the survey are available for 1969, 1978, 1982, 1984, 1986, 1990, 1992, 1996, through the Data Liberation Initiative member institutions or directly ordering the CDs from Statistics Canada.
	www.library.uiuc.edu /doc/newpages/microdata/sources.htm (8386 words)

	Supplemental Security Income (SSI) Public-Use Microdata File, 2001 Data
		The SSI Public-Use Microdata File drawn from the SSR represents only persons who received a federal SSI payment in December 2001; it excludes persons who received a federally administered state supplementary payment but no federal SSI payment in December 2001.
		The SSI Public-Use Microdata File contains an extract of data fields from the SSR and consists of a 5 percent random, representative sample of persons who received a federal SSI payment in December 2001.
		Since the sample for the SSI Public-Use Microdata File is a representative 5 percent systematic random sample of persons receiving an SSI payment in December 2001, all records have weight equal to 20.
	www.ssa.gov /policy/docs/microdata/ssr/index.html (712 words)

	Census of Population and Housing, 2000 [California Reformatted Data]: Public Use Microdata Sample [1% and 5% PUMS]
		STUDY DESCRIPTION: Public Use Microdata Sample (PUMS) files contain records representing 1-percent or 5-percent samples of the occupied and vacant housing units in the U.S. and the people in the occupied units.
		Microdata are for those users who want to create do-it-yourself tabulations.
		Microdata files show the full range of responses made on individual questionnaires.
	ssdc.ucsd.edu /ssdc/pum00001.html (757 words)

	Old Age, Survivors, and Disability Insurance (OASDI) Public-Use Microdata File, 2001 Data
		The OASDI Public-Use Microdata File contains an extract of data fields from the MBR and consists of a 1 percent random, representative sample of persons entitled to receive an OASDI benefit payment for December 2001.
		Records on the underlying file for persons entitled to receive an OASDI benefit payment for December 2001 were ordered by state, by sex within state, by age within sex, and by type of benefit within age; a systematic 1 percent random sample was then selected.
		Since the sample for the OASDI Public-Use Microdata File is a representative 1 percent systematic random sample of persons entitled to receive an OASDI benefit payment for December 2001, all records have weight equal to 100.
	www.ssa.gov /policy/docs/microdata/mbr/index.html (672 words)

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	www.microdata.se (107 words)

	Public Use Microdata Sample Files - Census 2000 (Site not responding. Last check: 2007-11-03)
		Data swapping is done by editing the source data or exchanging records for a sample of cases.
		Swapping is applied to individual records and, therefore, also protects microdata.
		Instead of identifying variable categories based upon pretabulation assumptions about the composition of the population, the approach develops variable collapsing requirements after the microdata samples have been drawn.
	www.atmosfear.ro /population/www/cen2000/pums.html (1774 words)

	The Center for Economic Studies (Site not responding. Last check: 2007-11-03)
		More importantly, providing qualified researchers access to confidential microdata enables research projects that would not be possible without access to respondent-level information.
		Exposing to the light of research the conceptual and processing assumptions that are embedded in the Census Bureau's micro databases constitutes a core element in the Census Bureau's commitment to quality.
		The constraints stem from the legal requirements to maintain confidentiality of the underlying microdata files to which you may be granted access, the requirement that researchers' projects benefit Census Bureau data programs, and (not least) the mission of CES itself.
	www.ces.census.gov /ces.php/rdc (4868 words)

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