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  2. Fold change - Wikipedia

    en.wikipedia.org/wiki/Fold_change

    [8] [9] However, log-ratios are often used for analysis and visualization of fold changes. The logarithm to base 2 is most commonly used, [8] [9] as it is easy to interpret, e.g. a doubling in the original scaling is equal to a log 2 fold change of 1, a quadrupling is equal to a log 2 fold change of 2 and so on.

  3. Exponentiation - Wikipedia

    en.wikipedia.org/wiki/Exponentiation

    Graphs of y = b x for various bases b: base 10, base e, base 2, base ⁠ 1 / 2 ⁠. Each curve passes through the point (0, 1) because any nonzero number raised to the power of 0 is 1 . At x = 1 , the value of y equals the base because any number raised to the power of 1 is the number itself.

  4. Darcy friction factor formulae - Wikipedia

    en.wikipedia.org/wiki/Darcy_friction_factor_formulae

    9.287 = 18.574 / 2 = 2.51 × 3.7. The additional equivalent forms above assume that the constants 3.7 and 2.51 in the formula at the top of this section are exact.

  5. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable.The general form of its probability density function is [2] [3] = ().

  6. List of countries by external debt - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    This is a list of countries by external debt: it is the total public and private debt owed to nonresidents repayable in internationally accepted currencies, goods or services, where the public debt is the money or credit owed by any level of government, from central to local, and the private debt the money or credit owed by private households or private corporations based on the country under ...

  7. Massachusetts - Wikipedia

    en.wikipedia.org/wiki/Massachusetts

    The corporate income tax rate is 8.8%, [299] and the short-term capital gains tax rate is 12%. [300] An unusual provision allows filers to voluntarily pay at the pre-referendum 5.85% income tax rate, which is done by between one and two thousand taxpayers per year.

  8. List of European countries by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_European_countries...

    Estimation of the World Bank Group for 2022. [2] [3] [4] The data is filtered according to the list of countries in Europe.In the World Bank Group list and, accordingly, in this list, there are no mini-states with a population of several tens of thousands of people (Andorra, Monaco, San Marino, Vatican City).

  9. List of countries by age at first marriage - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_age...

    22.8 25.2 4.8 1.21 2020 [2] Namibia [a] 31.7: 29.2 30.5 2.5 1.09 2006-2007 [3] Niger: 22.8: 19.2 21 3.6 1.19 2017 [2] Nigeria : 24.8: 19.2 22 5.6 1.29 2018 [2] Rwanda [a] 24.7: 20.6 22.7 4.1 1.2 2010 [3] São Tomé and Príncipe [a] 24.1: 19.1 21.6 5 1.26 2008-2009 [3] Senegal: 31.8: 25.4 28.6 6.4 1.25 2022 [2] Seychelles: 35.3: 31.1 33.2 4.2 1 ...