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  2. Level of measurement - Wikipedia

    en.wikipedia.org/wiki/Level_of_measurement

    Level of measurement or scale of measure is a classification that describes the nature of information within the values assigned to variables. [1] Psychologist Stanley Smith Stevens developed the best-known classification with four levels, or scales, of measurement: nominal , ordinal , interval , and ratio .

  3. Standard (metrology) - Wikipedia

    en.wikipedia.org/wiki/Standard_(metrology)

    In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. [1] Standards are the fundamental reference for a system of weights and measures , against which all other measuring devices are compared.

  4. Hierarchy of evidence - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_evidence

    A large number of hierarchies of evidence have been proposed. Similar protocols for evaluation of research quality are still in development. So far, the available protocols pay relatively little attention to whether outcome research is relevant to efficacy (the outcome of a treatment performed under ideal conditions) or to effectiveness (the outcome of the treatment performed under ordinary ...

  5. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    There are three levels of standards in the hierarchy of metrology: primary, secondary, and working standards. [20] Primary standards (the highest quality) do not reference any other standards. Secondary standards are calibrated with reference to a primary standard.

  6. Statistical data type - Wikipedia

    en.wikipedia.org/wiki/Statistical_data_type

    The concept of data type is similar to the concept of level of measurement, but more specific. For example, count data requires a different distribution (e.g. a Poisson distribution or binomial distribution) than non-negative real-valued data require, but both fall under the same level of measurement (a ratio scale).

  7. Here's why Trump thinks tariffs are good for the U.S. - AOL

    www.aol.com/heres-why-trump-thinks-tariffs...

    President-elect Donald Trump is proposing sweeping new tariffs on Mexico, Canada and China as soon as he takes office. Here's why.

  8. College football games today: How to watch, stream Saturday's ...

    www.aol.com/college-football-games-today-watch...

    With CFP positioning on the line in many of these games, here is how to watch all of the action today that will shape the playoff.

  9. Star schema - Wikipedia

    en.wikipedia.org/wiki/Star_schema

    Time dimension tables describe time at the lowest level of time granularity for which events are recorded in the star schema; Geography dimension tables describe location data, such as country, state, or city; Product dimension tables describe products; Employee dimension tables describe employees, such as sales people

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