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  2. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    1.44 minutes, or 86.4 seconds. Also marketed as a ".beat" by the Swatch corporation. moment: 1/40 solar hour (90 s on average) Medieval unit of time used by astronomers to compute astronomical movements, length varies with the season. [4] Also colloquially refers to a brief period of time. centiday 0.01 d (1 % of a day) 14.4 minutes, or 864 ...

  3. Mean time between failures - Wikipedia

    en.wikipedia.org/wiki/Mean_time_between_failures

    where B 10 is the number of operations that a device will operate prior to 10% of a sample of those devices would fail and n op is number of operations. B 10d is the same calculation, but where 10% of the sample would fail to danger. n op is the number of operations/cycle in one year. [11]

  4. Programmable calculator - Wikipedia

    en.wikipedia.org/wiki/Programmable_calculator

    Originally, calculator programming had to be done in the calculator's own command language, but as calculator hackers discovered ways to bypass the main interface of the calculators and write assembly language programs, calculator companies (particularly Texas Instruments) began to support native-mode programming on their calculator hardware ...

  5. Logarithmic scale - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_scale

    Unlike a linear scale where each unit of distance corresponds to the same increment, on a logarithmic scale each unit of length is a multiple of some base value raised to a power, and corresponds to the multiplication of the previous value in the scale by the base value. In common use, logarithmic scales are in base 10 (unless otherwise specified).

  6. Tick size - Wikipedia

    en.wikipedia.org/wiki/Tick_size

    Tick sizes can be fixed (e.g., USD 0.0001) or vary according to the current price (common in European markets) with larger increments at higher prices. Heavily-traded stocks are given smaller tick sizes. An instrument price is always a rational number and the tick sizes determine the numbers that are permissible for a given instrument and exchange.

  7. Stochastic process - Wikipedia

    en.wikipedia.org/wiki/Stochastic_process

    [91] [99] [103] If the mean of any increment is zero, then the resulting Wiener or Brownian motion process is said to have zero drift. If the mean of the increment for any two points in time is equal to the time difference multiplied by some constant μ {\displaystyle \mu } , which is a real number, then the resulting stochastic process is said ...

  8. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    The doubling time is the time it takes for a population to double in size/value. It is applied to population growth, inflation, resource extraction, consumption of goods, compound interest, the volume of malignant tumours, and many other things that tend to grow over time.

  9. Hurst exponent - Wikipedia

    en.wikipedia.org/wiki/Hurst_exponent

    To estimate the Hurst exponent, one must first estimate the dependence of the rescaled range on the time span n of observation. [7] A time series of full length N is divided into a number of nonoverlapping shorter time series of length n, where n takes values N, N/2, N/4, ... (in the convenient case that N is a power of 2).