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  2. Symmetric mean absolute percentage error - Wikipedia

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

    The following example illustrates this by applying the second SMAPE formula: Over-forecasting: A t = 100 and F t = 110 give SMAPE = 4.76%; Under-forecasting: A t = 100 and F t = 90 give SMAPE = 5.26%.

  3. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Because pairs of numbers that are aligned on the logarithmic scales form constant ratios, no matter how the scales are offset, slide rules can be used to generate equivalent fractions that solve proportion and percent problems. For example, setting 7.5 on one scale over 10 on the other scale, the user can see that at the same time 1.5 is over 2 ...

  4. 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]

  5. 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.

  6. 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.

  7. 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 ]

  8. St. Louis - Wikipedia

    en.wikipedia.org/wiki/St._Louis

    One prominent example, ... (18.2) 71.0 (21.7) 79.4 (26.3) 86.4 (30.2) 90.4 (32.4) 95.5 ... (which is the sum of violent crimes and property crimes) per 100,000. In ...