science

Sparkline

Sparkline is a science 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 Sparkline rather than just read about it. In short: A sparkline is a very small line chart, typically drawn without axes or coordinates. It presents the general shape of a variation (typically over time) in some measurement, such as temperature or stock market price, in a simple and highly condensed way.

Key takeaways

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

Reference excerpt

A sparkline is a very small line chart, typically drawn without axes or coordinates. It presents the general shape of a variation (typically over time) in some measurement, such as temperature or stock market price, in a simple and highly condensed way. Whereas a typical chart is designed to professionally show as much data as possible, and is set off from the flow of text, sparklines are intended to be succinct, memorable, and located where they are discussed. Sparklines are small enough to be embedded in text, or several sparklines may be grouped together as elements of a small multiple.

History

In 1762 Laurence Sterne used typographical devices in his sixth volume of The Life and Opinions of Tristram Shandy, Gentleman to illustrate his narrative proceeding: "These were the four lines I moved through my first, second, third, and fourth volumes,–". The 1888 monograph describing the 1883 eruption of Krakatoa shows barometric signatures of the event obtained at various stations around the world in the same fashion, but in separate plates (VII & VIII), not within the text. Edward Tufte documented a compact style in 1983 called "intense continuous time-series". He introduced the term sparkline in 2006 for "small, high resolution graphics embedded in a context of words, numbers, images", which are "data-intense, design-simple, word-sized graphics". Later in 2020, Tufte attributed the idea to Donald Knuth's "METAFONTbook".

The first software sparkline was programmed in 1999 by Peter Zelchenko. He introduced "an inline-chart" feature for Mike Medved's QuoteTracker. TD Ameritrade later discontinued QuoteTracker. On May 7, 2008, Microsoft employees filed a patent application for the implementation of sparklines in Microsoft Excel 2010. The application was published on November 12, 2009, prompting Tufte to express concerns about patent breadth and non-novelty. On 23 January, 2009, MultiRacio Ltd. published an OpenOffice.org Calc extension named "EuroOffice Sparkline". On March 3, 2022, Tomaž Vajngerl implemented sparklines in LibreOffice Calc version 7.4, including support for importing sparklines from the OOXML Workbook format.

Usage Sparklines are frequently used in line with text. For example: The Dow Jones Industrial Average for February 7, 2006 . The sparkline should be about the same height as the text around it. Tufte offers some useful design principles for the sizing of sparklines to maximize their readability.

Illustrations

Worked examples

Example 1 — a first encounter with Sparkline

Start with the simplest possible case. Write down what Sparkline claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Sparkline 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 Sparkline 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 Sparkline

In research: Sparkline appears in science 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 Sparkline 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: Sparkline is common in secondary-school and first-year university syllabi. It links to neighbouring topics Infographics, so understanding it makes those chapters shorter.
In everyday life: Look for Sparkline 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 Sparkline in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sparkline 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 Sparkline out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sparkline in simple terms?

Why does Sparkline matter?

Because it connects several science 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 Sparkline?

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 Sparkline.