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  2. Proportionality (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Proportionality_(mathematics)

    In mathematics, two sequences of numbers, often experimental data, are proportional or directly proportional if their corresponding elements have a constant ratio. The ratio is called coefficient of proportionality (or proportionality constant ) and its reciprocal is known as constant of normalization (or normalizing constant ).

  3. Proportional representation - Wikipedia

    en.wikipedia.org/wiki/Proportional_representation

    The term proportional representation may be used to mean fair representation by population as applied to states, regions, etc. However, representation being proportional with respect solely to population size is not considered to make an electoral system "proportional" the way the term is usually used.

  4. Proportionality - Wikipedia

    en.wikipedia.org/wiki/Proportionality

    Proportional control, a type of linear feedback control system; Other uses. Proportionality (law), a legal principle; Proportionality (International Humanitarian ...

  5. Proportional reasoning - Wikipedia

    en.wikipedia.org/wiki/Proportional_reasoning

    In Piaget's model of intellectual development, the fourth and final stage is the formal operational stage.In the classic book "The Growth of Logical Thinking from Childhood to Adolescence" by Jean Piaget and Bärbel Inhelder formal operational reasoning takes many forms, including propositional reasoning, deductive logic, separation and control of variables, combinatorial reasoning, and ...

  6. Party-list proportional representation - Wikipedia

    en.wikipedia.org/wiki/Party-list_proportional...

    Poster for the European Parliament election 2004 in Italy, showing party lists. Party-list proportional representation (list-PR) is a system of proportional representation based on preregistered political parties, with each party being allocated a certain number of seats roughly proportional to their share of the vote.

  7. Proportional control - Wikipedia

    en.wikipedia.org/wiki/Proportional_control

    Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable, and the size of the correction is proportional to the difference between the desired value (setpoint, SP) and the measured value (process variable, PV).

  8. Probability-proportional-to-size sampling - Wikipedia

    en.wikipedia.org/wiki/Probability-proportional...

    This is proportional to some known quantity so that = =. [ 1 ] : 97 [ 2 ] One of the cases this occurs in, as developed by Hanson and Hurwitz in 1943, [ 3 ] is when we have several clusters of units, each with a different (known upfront) number of units, then each cluster can be selected with a probability that is proportional to the number of ...

  9. Proportional symbol map - Wikipedia

    en.wikipedia.org/wiki/Proportional_symbol_map

    A proportional symbol map or proportional point symbol map is a type of thematic map that uses map symbols that vary in size to represent a quantitative variable. [1]: 131 For example, circles may be used to show the location of cities within the map, with the size of each circle sized proportionally to the population of the city. Typically ...