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Krackhardt E/I Ratio

Krackhardt E/I Ratio is a computer 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 Krackhardt E/I Ratio rather than just read about it. In short: The Krackhardt E/I Ratio (or variously the E-I Index) is a social network measure which the relative density of internal connections within a social group compared to the number of connections that group has to the external world. It was so described in a 1988 paper by David Krackhardt and Robert N.

Key takeaways

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

Reference excerpt

The Krackhardt E/I Ratio (or variously the E-I Index) is a social network measure which the relative density of internal connections within a social group compared to the number of connections that group has to the external world. It was so described in a 1988 paper by David Krackhardt and Robert N. Stern noting the increased effectiveness in moments of crisis of organizations which had stronger informal networks that crossed formal internal group structures.

Comparisons with network theory The E/I ratio is related to the concept of conductance, which measures the likelihood that a random walk on a subgraph will exit that subgraph.

References Informal networks and organizational crises: An experimental simulation. David Krackhardt, Robert N. Stern - Social Psychology Quarterly, 1988, DOI:10.2307/2786835

See also Conductance (graph) Percolation

Worked examples

Example 1 — a first encounter with Krackhardt E/I Ratio

Start with the simplest possible case. Write down what Krackhardt E/I Ratio claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer 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 Krackhardt E/I Ratio 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 Krackhardt E/I Ratio 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 Krackhardt E/I Ratio

In research
Krackhardt E/I Ratio appears in computer 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 Krackhardt E/I Ratio 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
Krackhardt E/I Ratio is common in secondary-school and first-year university syllabi. It links to neighbouring topics Social network analysis, Sociology stubs, so understanding it makes those chapters shorter.
In everyday life
Look for Krackhardt E/I Ratio 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 Krackhardt E/I Ratio in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Krackhardt E/I Ratio means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Krackhardt E/I Ratio out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Krackhardt E/I Ratio in simple terms?

The Krackhardt E/I Ratio (or variously the E-I Index) is a social network measure which the relative density of internal connections within a social group compared to the number of connections that group has to the external world. It was so described in a 1988 paper by David Krackhardt and Robert N.

Why does Krackhardt E/I Ratio matter?

Because it connects several computer 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 Krackhardt E/I Ratio?

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 Krackhardt E/I Ratio.

Tags

  • Social network analysis
  • Sociology stubs

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