science

Paradata

Paradata 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 Paradata rather than just read about it. In short: The paradata of a data set or survey are data about the process by which the data were collected. Paradata of a survey are usually "administrative data about the survey." Example paradata topics about a survey include the times of day interviews were conducted, how long the interviews took, how many times there were contacts with each interviewee or attempts to contact the interviewee, the reluctance of the intervie…

Key takeaways

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

Reference excerpt

The paradata of a data set or survey are data about the process by which the data were collected. Paradata of a survey are usually "administrative data about the survey." Example paradata topics about a survey include the times of day interviews were conducted, how long the interviews took, how many times there were contacts with each interviewee or attempts to contact the interviewee, the reluctance of the interviewee, and the mode of communication (such as phone, Web, email, or in person). Thus there are paradata about each observation in the survey. These attributes affect the costs and management of a survey, the findings of a survey, evaluations of interviewers, and inferences one might make about non-respondents. Paradata information can be used to help achieve the goals of a survey. For example, early responses may be mainly from one type of respondent, and the collectors knowing this can focus on reaching the other types so the survey has good coverage of the intended population. Thus survey efforts can be dynamically responsive to the paradata. In principle a survey's metadata includes its paradata. The term is attributed to Couper (1998).

References

Worked examples

Example 1 — a first encounter with Paradata

Start with the simplest possible case. Write down what Paradata 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 Paradata 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 Paradata 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 Paradata

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

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

Frequently asked questions

What is Paradata in simple terms?

Why does Paradata 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 Paradata?

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 Paradata.