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  2. Race and ethnicity in the United States - Wikipedia

    en.wikipedia.org/wiki/Race_and_ethnicity_in_the...

    At the federal level, race and ethnicity have been categorized separately. The most recent United States census recognized five racial categories ( White, Black, Native American / Alaska Native, Asian, and Native Hawaiian / Other Pacific Islander ), as well as people who belong to two or more of the racial categories.

  3. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .

  4. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    Where s is the s-plane variable, ω is angular frequency and j is the imaginary unit.. Chebyshev filters. Sometimes other ratios are more convenient than the 3 dB point. For instance, in the case of the Chebyshev filter it is usual to define the cutoff frequency as the point after the last peak in the frequency response at which the level has fallen to the design value of the passband ripple.

  5. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    Order of operations. In mathematics and computer programming, the order of operations is a collection of rules that reflect conventions about which operations to perform first in order to evaluate a given mathematical expression . These rules are formalized with a ranking of the operations. The rank of an operation is called its precedence, and ...

  6. Variance-based sensitivity analysis - Wikipedia

    en.wikipedia.org/wiki/Variance-based_sensitivity...

    Variance-based sensitivity analysis (often referred to as the Sobol’ method or Sobol’ indices, after Ilya M. Sobol’) is a form of global sensitivity analysis. Working within a probabilistic framework, it decomposes the variance of the output of the model or system into fractions which can be attributed to inputs or sets of inputs.

  7. Robert's Rules of Order - Wikipedia

    en.wikipedia.org/wiki/Robert's_Rules_of_Order

    History Henry M. Robert. A U.S. Army officer, Henry Martyn Robert (1837–1923), saw a need for a standard of parliamentary procedure while living in San Francisco.He found San Francisco in the mid-to-late 19th century to be a chaotic place where meetings of any kind tended to be tumultuous, with little consistency of procedure and with people of many nationalities and traditions thrown together.

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