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  2. Composite measure - Wikipedia

    en.wikipedia.org/wiki/Composite_measure

    Composite measure in statistics and research design refer to composite measures of variables, i.e. measurements based on multiple data items. [1]An example of a composite measure is an IQ test, which gives a single score based on a series of responses to various questions.

  3. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    An SI derived unit is a named combination of base units such as hertz (cycles per second), newton (kg⋅m/s 2), and tesla (1 kg⋅s −2 ⋅A −1) and in the case of Celsius a shifted scale from Kelvin. Certain units have been officially accepted for use with the SI. Some of these are decimalised, like the litre and electronvolt, and are ...

  4. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    Nonetheless, the residual and irreducible instability of a physical IPK undermined the reliability of the entire metric system to precision measurement from small (atomic) to large (astrophysical) scales. [39] By avoiding the use of an artefact to define units, all issues with the loss, damage, and change of the artefact are avoided. [1]: 125

  5. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    Multiples and submultiples of metric units are related by powers of ten and their names are formed with prefixes. This relationship is compatible with the decimal system of numbers and it contributes greatly to the convenience of metric units. In the early metric system there were two base units, the metre for length and the gram for mass. The ...

  6. Multidimensional scaling - Wikipedia

    en.wikipedia.org/wiki/Multidimensional_scaling

    Metric scaling uses a power transformation with a user-controlled exponent : and for distance. In classical scaling p = 1. {\textstyle p=1.} Non-metric scaling is defined by the use of isotonic regression to nonparametrically estimate a transformation of the dissimilarities.

  7. Measurement - Wikipedia

    en.wikipedia.org/wiki/Measurement

    The metric system is a decimal system of measurement based on its units for length, the metre and for mass, the kilogram. It exists in several variations, with different choices of base units, though these do not affect its day-to-day use. Since the 1960s, the International System of Units (SI) is the internationally recognised metric system.

  8. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    Environmental policy is based on research data, and accurate measurements are important for assessing climate change and environmental regulation. [69] Aside from regulation, metrology is essential in supporting innovation, the ability to measure provides a technical infrastructure and tools that can then be used to pursue further innovation.

  9. Metric - Wikipedia

    en.wikipedia.org/wiki/Metric

    The word metric is often used to mean a descriptive statistic, indicator, or figure of merit used to describe or measure something quantitatively, including: Performance indicator , a measure of an organization's activities and performance