mathematics

Social Security Death Index

Social Security Death Index is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Social Security Death Index rather than just read about it. In short: The Social Security Death Index (SSDI) was a database of death records created from the United States Social Security Administration's Death Master File until 2014. Since 2014, public access to the updated Death Master File has been via the Limited Access Death Master File certification program instituted under Title 15 Part 1110.

Key takeaways

Social Security Death Index belongs to mathematics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Social Security Death Index to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Social Security Death Index from memory before moving on to harder problems.

Reference excerpt

The Social Security Death Index (SSDI) was a database of death records created from the United States Social Security Administration's Death Master File until 2014. Since 2014, public access to the updated Death Master File has been via the Limited Access Death Master File certification program instituted under Title 15 Part 1110. Most persons who have died since 1936 who had a Social Security Number (SSN) and whose death has been reported to the Social Security Administration are listed in the SSDI. For most years since 1973, the SSDI includes 93 percent to 96 percent of deaths of individuals aged 65 or older. It was frequently updated; the version of June 22, 2011 contained 89,835,920 records. Unlike the Death Master File, the SSDI is available to the public at many online genealogy websites. The SSDI is a popular tool for genealogists and biographers because it contains valuable genealogical data.

Data contained Data in the Social Security Death Index include:

Given name and surname; and since the 1990s, middle initial Date of birth Month and year of death; or full date of death for accounts active in 2000 or later Social Security number State or territory where the Social Security number was issued Last place of residence while the person was alive (ZIP code). Once a deceased person is found in the database, the person's application for Social Security card (Form SS-5) can be ordered from the Social Security Administration. The SS-5 may contain additional genealogical data, such as birthplace, father's name, and mother's full maiden name or that information may be blacked out.

Criticisms A government audit revealed that the Social Security Administration had incorrectly listed 23,000 people as dead in a two-year period. These people sometimes faced difficulties in convincing government agencies that they were actually alive; a 2008 story in the Nashville area focused on a woman who was incorrectly flagged as dead in the Social Security computers in 2000 and had difficulties, such as having health insurance canceled and electronically filed tax returns rejected. This story also noted that such people could be highly vulnerable to identity theft because of the release of their Social Security numbers. In November 2011, due to privacy and identity theft concerns, the Social Security Administration redacted and no longer included death data derived from State sources. This resulted in an approximately 33% drop in reported deaths. On December 18, 2011, Ancestry.com, changed access to the SSDI by moving the SSDI search behind a paywall, and stopped displaying the Social Security information of people who had died within the past 10 years. Some of their originally free information is now available via paid subscription only. However, other sites still provide free access. In March 2012, the entire Death Master File, edition of November 30, 2011, was made available for download. An updated version was made available May 31, 2013. Updates have also been available by a subscription service. A review by the Government Accountability Office in 2013 found that the Social Security Administration and other federal benefit-paying agencies that use data from the Death Master File are potentially vulnerable to making improper payments due to errors or processes that could lead to errors.

Worked examples

Example 1 — a first encounter with Social Security Death Index

Start with the simplest possible case. Write down what Social Security Death Index claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Social Security Death Index before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Social Security Death Index ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Social Security Death Index

In research: Social Security Death Index appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Social Security Death Index in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Social Security Death Index is common in secondary-school and first-year university syllabi. It links to neighbouring topics Civil registration and vital statistics, Death in the United States, Death indexes, so understanding it makes those chapters shorter.
In everyday life: Look for Social Security Death Index outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Social Security Death Index in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Social Security Death Index means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Social Security Death Index out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Social Security Death Index in simple terms?

Why does Social Security Death Index matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Social Security Death Index?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Social Security Death Index.