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  2. Symmetric mean absolute percentage error - Wikipedia

    en.wikipedia.org/wiki/Symmetric_mean_absolute...

    In contrast to the mean absolute percentage error, SMAPE has both a lower and an upper bound. Indeed, the formula above provides a result between 0% and 200%. Indeed, the formula above provides a result between 0% and 200%.

  3. Data analysis - Wikipedia

    en.wikipedia.org/wiki/Data_analysis

    Part-to-whole: Categorical subdivisions are measured as a ratio to the whole (i.e., a percentage out of 100%). A pie chart or bar chart can show the comparison of ratios, such as the market share represented by competitors in a market. [53]

  4. Dempster–Shafer theory - Wikipedia

    en.wikipedia.org/wiki/Dempster–Shafer_theory

    Arthur P. Dempster at the Workshop on Theory of Belief Functions (Brest, 1 April 2010).. The theory of belief functions, also referred to as evidence theory or Dempster–Shafer theory (DST), is a general framework for reasoning with uncertainty, with understood connections to other frameworks such as probability, possibility and imprecise probability theories.

  5. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    The 2 on the top scale is placed over the 5.5 on the bottom scale. The resulting quotient, 2.75, can then be read below the top scale's 1: There is more than one method for doing division, and the method presented here has the advantage that the final result cannot be off-scale, because one has a choice of using the 1 at either end.

  6. Deep learning - Wikipedia

    en.wikipedia.org/wiki/Deep_learning

    The first working deep learning algorithm was the Group method of data handling, a method to train arbitrarily deep neural networks, published by Alexey Ivakhnenko and Lapa in 1965. They regarded it as a form of polynomial regression, [ 39 ] or a generalization of Rosenblatt's perceptron. [ 40 ]

  7. Penrose method - Wikipedia

    en.wikipedia.org/wiki/Penrose_method

    A mathematical formulation of this idea results in the square root rule. The Penrose method is not currently being used for any notable decision-making body, but it has been proposed for apportioning representation in a United Nations Parliamentary Assembly, [1] [2] and for voting in the Council of the European Union. [3] [4]

  8. St. Louis - Wikipedia

    en.wikipedia.org/wiki/St._Louis

    The population density was 5,158.2 people per square mile (1,991.6 people/km 2). About 24% of the population was 19 or younger, 9% were 20 to 24, 31% were 25 to 44, 25% were 45 to 64, and 11% were 65 or older.

  9. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    In Fortran, = serves as an assignment operator: X = 2 sets the value of X to 2. This somewhat resembles the use of = in a mathematical definition, but with different semantics: the expression following = is evaluated first, and may refer to a previous value of X. For example, the assignment X = X + 2 increases the value of X by 2.