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  2. Incremental cost-effectiveness ratio - Wikipedia

    en.wikipedia.org/wiki/Incremental_cost...

    The incremental cost-effectiveness ratio (ICER) is a statistic used in cost-effectiveness analysis to summarise the cost-effectiveness of a health care intervention ...

  3. Derangement - Wikipedia

    en.wikipedia.org/wiki/Derangement

    This case is equivalent to solving the problem with n − 1 people and n − 1 hats because for each of the n − 1 people besides P 1 there is exactly one hat from among the remaining n − 1 hats that they may not receive (for any P j besides P i, the unreceivable hat is h j, while for P i it is h 1).

  4. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

  5. Odds ratio - Wikipedia

    en.wikipedia.org/wiki/Odds_ratio

    The sample odds ratio n 11 n 00 / n 10 n 01 is easy to calculate, and for moderate and large samples performs well as an estimator of the population odds ratio. When one or more of the cells in the contingency table can have a small value, the sample odds ratio can be biased and exhibit high variance .

  6. Fermi problem - Wikipedia

    en.wikipedia.org/wiki/Fermi_problem

    A Fermi problem (or Fermi quiz, Fermi question, Fermi estimate), also known as a order-of-magnitude problem (or order-of-magnitude estimate, order estimation), is an estimation problem in physics or engineering education, designed to teach dimensional analysis or approximation of extreme scientific calculations.

  7. Void ratio - Wikipedia

    en.wikipedia.org/wiki/Void_ratio

    The void ratio of a mixture of solids and fluids (gases and liquids), or of a porous ...

  8. Tsiolkovsky rocket equation - Wikipedia

    en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

    A rocket's required mass ratio as a function of effective exhaust velocity ratio. The classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity and can thereby move due to the ...

  9. Cephalopod intelligence - Wikipedia

    en.wikipedia.org/wiki/Cephalopod_intelligence

    3 Problem-solving ability. 4 Protective legislation. 5 See also. 6 References. ... [10] and their brain-to-body mass ratio is the largest among the invertebrates, ...

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