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<li><a href="/policy/docs/program-explainers/retirement-earnings-test.html">Retirement Earnings Test</a></li>
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<li><a href="/policy/docs/program-explainers/scheduled-payable.html">Scheduled <abbr title="versus">vs.</abbr> Payable Benefits</a></li>
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<li><a href="/policy/docs/program-explainers/special-minimum.html">Special Minimum Benefit</a></li>
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<li><a href="/policy/docs/program-explainers/poverty-decline.html">Why Will Poverty Decline for Beneficiaries?</a></li>
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<li><a href="/policy/docs/program-explainers/windfall-elimination-provision.html">Windfall Elimination Provision</a></li>
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<li class="noClick menu1a" id="PM"><a href="#" tabindex="-1">Projections</a></li>
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<li class="hasFly menu2a" id="PFS"><a href="#" aria-haspopup="true" aria-expanded="false">Fact sheets</a>
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<ul>
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<li><a href="/policy/docs/projections/populations/divorced-spousal-2050.html">By beneficiary type</a></li>
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<li><a href="/policy/docs/projections/populations/beneficiaries-60-or-older.html">By demographic group</a></li>
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</ul>
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<li><a href="/policy/docs/projections/policy-options/index.html">Policy options/proposals</a></li>
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<li><a href="/policy/docs/projections/tables/beneficiaries.html">Profile of beneficiaries by race & ethnicity</a></li>
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<li><a href="/policy/docs/projections/tables/taxpayers.html">Profile of taxpayers by race & ethnicity</a></li>
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<div class="column-6">
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<div id="docTitle">
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<h3>Supplemental Security Income (<abbr class="spell">SSI</abbr>) Public-Use Microdata File, 2001 Data</h3>
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<div class="releaseDate">(released October 2003)</div>
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</div>
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<div id="fileList">
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<div class="toggle-link margin-top"> <a class="plus" href="#">Background</a>
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<div>
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<p>The <abbr class="spell">SSI</abbr> program is a means-tested income assistance program for disabled, blind, and aged persons who have limited income and resources. This program is administered in conjunction with the states. Extensive information about the <abbr class="spell">SSI</abbr> program can be found in the following publications:</p>
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<ul>
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<li><a href="/OACT/ssir/">Annual Report of the Supplemental Security Income Program</a></li>
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<li><a href="/policy/docs/statcomps/supplement/index.html">Annual Statistical Supplement</a></li>
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<li><a href="/OP_Home/handbook/handbook.html">Social Security Handbook</a></li>
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<li><a href="/policy/docs/statcomps/ssi_asr"><abbr class="spell">SSI</abbr> Annual Statistical Report</a></li>
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<li><a href="/ssi/text-understanding-ssi.htm">Understanding Supplemental Security Income</a></li>
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</ul>
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</div>
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</div>
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<div class="toggle-link"> <a class="plus" href="#">Content and Sample Design</a>
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<div>
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<p>Information needed to administer the federal <abbr class="spell">SSI</abbr> program resides on the Supplemental Security Record (<abbr class="spell">SSR</abbr>) file, which in December 2001 contained records for approximately 6.4 million individuals who received a federal <abbr class="spell">SSI</abbr> benefit for that month. The <abbr class="spell">SSI</abbr> Public-Use Microdata File drawn from the <abbr class="spell">SSR</abbr> represents only persons who received a federal <abbr class="spell">SSI</abbr> payment in December 2001; it excludes persons who received a federally administered state supplementary payment but no federal <abbr class="spell">SSI</abbr> payment in December 2001.</p>
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<p>The <abbr class="spell">SSI</abbr> Public-Use Microdata File contains an extract of data fields from the <abbr class="spell">SSR</abbr> and consists of a 5 percent random, representative sample of persons who received a federal <abbr class="spell">SSI</abbr> payment in December 2001. Records in the underlying <abbr class="spell">SSR</abbr> for persons who received a federal <abbr class="spell">SSI</abbr> payment for December 2001 were ordered by state, by disability diagnosis within state, by age within disability diagnosis, and then by sex within age; a 5 percent systematic random sample was then selected. The file contains approximately 320,000 records, with 13 data fields on each record, and is available in a standard <abbr>SAS</abbr> file structure as well as the <abbr class="spell">CSV</abbr> file format.</p>
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<p>Since the sample for the <abbr class="spell">SSI</abbr> Public-Use Microdata File is a representative 5 percent systematic random sample of persons receiving an <abbr class="spell">SSI</abbr> payment in December 2001, all records have weight equal to 20. Variance and standard errors can be approximated with the standard formulas used for simple random sampling.</p>
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<p>Descriptions of data fields are provided in the Data Dictionary for this file. The descriptions cover the content of each field, the method of presentation, and the disclosure avoidance steps taken to provide confidentiality. Because information on the internal <abbr class="spell">SSR</abbr> record file is used to administer the <abbr class="spell">SSI</abbr> program, data quality is extremely high because data are validated and kept current. Note that the information on each file refers to a single time period—December 2001.</p>
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</div>
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</div>
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<div class="toggle-link"> <a class="plus" href="#">Confidentiality Protection</a>
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<div>
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<p>Individual identifiers have been removed from all records on this file and other distinguishing characteristics have been modified to prevent identification of persons to whom a record pertains. Records are sequenced in random order.</p>
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<p>Topcodes and bottomcodes are employed for all numeric fields to avoid showing extreme field values on a data record. Values beyond the topcode or bottomcode are replaced by the average of the values in excess of the respective topcode or bottomcode. Topcode and bottomcode values were derived at the national level, and the replacement values are derived and applied at the state level for this file (see <a href="/policy/docs/microdata/ssr/ssr_topcodes.html">table</a>). Values shown for categorical fields are groupings of detailed information from the internal file, and numeric variables are rounded to the nearest $5. All topcode and bottomcode values, replacement values, and information on detail groupings are provided to users as part of file documentation.</p>
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</div>
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</div>
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<h4 id="files">Available Files</h4>
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<ul>
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<li><a href="/policy/docs/microdata/ssr/ssr_dictionary.pdf" rel="nofollow" title="Download Data Dictionary and Field Descriptors as PDF">Data Dictionary and Field Descriptors</a></li>
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<li><a href="/policy/docs/microdata/ssr/ssr_data.zip">2001 Data, <abbr>SAS</abbr> Format</a> <span class="eightypercent">(4.1 <abbr title="megabyte">MB</abbr> <abbr>ZIP</abbr> file, which unzips to 26.0 <abbr title="megabyte">MB</abbr> <abbr>SAS</abbr> file)</span></li>
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<li><a href="/policy/docs/microdata/ssr/ssr_csv.zip">2001 Data, <abbr class="spell">CSV</abbr> Format</a> <span class="eightypercent">(3.4 <abbr title="megabyte">MB</abbr> <abbr>ZIP</abbr> file, which unzips to 22.1 <abbr title="megabyte">MB</abbr> <abbr class="spell">CSV</abbr> file)</span></li>
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<li>Table of national topcode and bottomcode values and state replacement values (available in <a href="/policy/docs/microdata/ssr/ssr_topcodes.html"><abbr class="spell">HTML</abbr></a> or <a href="/policy/docs/microdata/ssr/ssr_topcodes.pdf" rel="nofollow"><abbr class="spell">PDF</abbr></a> format)</li>
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</ul>
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</div>
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</div>
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<div class="column-3">
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<div class="sidebar">
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<h4 class="sidebar-gray">Contact</h4>
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<p><a href="mailto:statistics@ssa.gov?subject=2001%20SSI%20Public%20Use%20File">statistics@ssa.gov</a></p>
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<p><a class="mailIcon" href="/policy/notify/index.html">Subscribe to Updates</a></p>
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<h4 class="sidebar-gray">Other Public-Use Files</h4>
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<p><a href="/policy/docs/microdata/earn/index.html">Benefits & Earnings, 2004</a><br> <a href="/policy/docs/microdata/epuf/index.html">Earnings, 2006</a><br><a href="/policy/docs/data/field-offices-2016/index.html">Field Office Listing, 2016</a><br><a href="/policy/docs/microdata/nbds/index.html">New Beneficiary Data</a><br><a href="/policy/docs/microdata/mbr/index.html"><abbr class="spell">OASDI</abbr>, 2001 Data</a><br><a href="/policy/docs/data/ssi-2010/index.html"><abbr class="spell">SSI</abbr> Summary Data, 2010</a><br></p>
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<h4 class="sidebar-gray">Disclaimer</h4>
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<p class="ninetypercent">These data files are available for research. Any findings and conclusions derived from analyses of these data are solely the <span class="nobr">researcher(s)</span> and do not reflect those of the Social Security Administration.</p>
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