science

RAJAR

RAJAR 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 RAJAR rather than just read about it. In short: Radio Joint Audience Research Limited (RAJAR; ) was established in 1992 to operate a single audience measurement system for the radio industry in the United Kingdom. RAJAR is jointly owned by the BBC and Radiocentre.

Key takeaways

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

Reference excerpt

Radio Joint Audience Research Limited (RAJAR; ) was established in 1992 to operate a single audience measurement system for the radio industry in the United Kingdom. RAJAR is jointly owned by the BBC and Radiocentre. RAJAR's predecessor was called Joint Industry Committee on Radio Audience Research (JICRAR; ). Prior to this, the BBC and Radiocentre's predecessor CRCA carried out their own measurements independently of each other.

Structure The company operates as a joint industry committee (JIC) and its board is chaired by an independent chairman. It has shareholder representation from the BBC and the commercial sector, as well as the, Institute of Practitioners in Advertising (IPA) and the Incorporated Society of British Advertisers (ISBA). The company is a non-profit making entity.

Purpose and methodology RAJAR collects information on behalf of over 300 BBC and Ofcom-licensed commercial radio stations, ranging from very small local services to the national networks. Station listening by time, duration, platform (AM/FM, DAB, online/app, and DTV) and location (in car, at home, at work, or elsewhere) is recorded and published on a quarterly basis. The research methodology is based on a continuous diary survey (ex. Christmas holidays) measuring the listening behaviour of over 54,000 adults (aged 15+) a year. The diary is filled in on a quarter-hour basis for one week's listening drawn from a sample representative of the individual station transmission area and the nation as a whole. The fieldwork for the research is carried out on behalf of RAJAR by specialist research contractors, currently Ipsos Mori. The sampling point framework is undertaken by RSMB Ltd. The diary-based system is the most common method of measuring radio audiences worldwide. Some countries have introduced electronic devices called audiometers. RAJAR has tested several audiometers but has not determined any viable for introduction in the UK market. RAJAR continues to work with developers to determine future viability of innovations with audiometers and any new measurement techniques that could be of use. Historically, the data has been collected from respondents via a paper diary. From quarter 3, 2011 RAJAR introduced an online version of a radio listening diary (Radio Diary) as an additional collection methodology. It is recognised that respondent engagement is critical to the continued quality of the survey and that by offering a choice as to how people record and return their listening data will help maintain the current high levels of participation and completion into the future. Additional benefits also include higher accuracy in attribution of listening to the different platforms (digital/non-digital) as well as higher in home completion that in turn enhances overall data quality.

References Peak, Steven; Fisher, Paul, eds. (2001). Media Guide (Ninth Annual ed.). Fourth Estate Classic House. p. 302. ISBN 1-84115-423-7. {{cite book}}: |work= ignored (help)

External links Official website

Worked examples

Example 1 — a first encounter with RAJAR

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

In research: RAJAR 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 RAJAR 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: RAJAR is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1992 establishments in the United Kingdom, Organizations established in 1992, Radio audience audit, so understanding it makes those chapters shorter.
In everyday life: Look for RAJAR 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 RAJAR in 20 minutes

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

Frequently asked questions

What is RAJAR in simple terms?

Why does RAJAR 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 RAJAR?

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 RAJAR.