Lecture 7 B Data and Info.

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    DEFINITION

    Data are raw facts and figures relating to people,

    places, things and events.

    CHARACTERISTICS Unprocessed,unorganized and discrete (in

    separate, unrelated chunks).

    Qualitative (opinion-based, subjective).

    Quantitative (measurement-based, objective). Detailed.

    Sampled.

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    DEFINITION

    Information is data that have been converted into ameaningful and useful context for use by specificusers.

    CHARACTERISTICS Information can be classified according to its content.

    For example, one can distinguish between factualinformation, simply describing a single idea which is

    (perceived to be) true; or analytical, usually based onan analysis of a number of facts.

    An alternative distinction is between subjectiveinformation (i.e. based on an individual's opinion), orobjective (i.e. rooted in fact).

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    CHARACTERISTICS

    Another important aspect of information is

    timeliness. Information which is true (andrelevant) at one point in time, might lose its

    truth or relevance at another point in time. Forexample, population statistics that were

    accurate in 2007 are no longer accurate in 2010.

    However, perhaps the most important

    characteristic of information is reliability. Noteverything that is presented as information is

    true and/or believable. It is important that you

    become aware that not everything you read is

    true.

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    CHARACTERISTICS

    It is also important that you become aware of

    information as a commodity. Information can besold and bought. Moreover, information is often

    owned by some individual or organization. Also,this brings out a number of issues to do with

    ethical and legal implications of the use of

    information technology. For example, issues to

    do with confidentiality and security areimportant considerations in this context.

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    CHARACTERISTICS Inconsistency. Is the final form similar to or means the

    same as its original form? Is it complete? e.g. omittedfacts, distortion.

    Incomprehensibility. Is it clear? Is it easy to

    understand? Subject to interpretation. Is the source/target

    objective or subjective? Do you understand it or knowwhat it means?

    Value. Is it important and useful? Is it truthful?

    Relevance. Is it significant? Is it applicable? Is it

    current? Confidentiality. Is it classified? Is it private or public?

    e.g. personal health, a countrys state of affairs.

    Timeliness. Is it immediate? Is it current? Is itapplicable? Can it be accessed quickly?