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  2. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    Another memory trick to calculate the allowed downtime duration for an "-nines" availability percentage is to use the formula seconds per day. For example, 90% ("one nine") yields the exponent 4 − 1 = 3 {\displaystyle 4-1=3} , and therefore the allowed downtime is 8.64 × 10 3 {\displaystyle 8.64\times 10^{3}} seconds per day.

  3. Rate of natural increase - Wikipedia

    en.wikipedia.org/wiki/Rate_of_natural_increase

    In demography and population dynamics, the rate of natural increase (RNI), also known as natural population change, is defined as the birth rate minus the death rate of a particular population, over a particular time period. [1] It is typically expressed either as a number per 1,000 individuals in the population [2] or as a percentage. [3]

  4. Psychological pricing - Wikipedia

    en.wikipedia.org/wiki/Psychological_pricing

    The introduction of the euro in 2002, with its various exchange rates, distorted existing nominal price patterns while at the same time retaining real prices. A European wide study (el Sehity, Hoelzl and Kirchler, 2005) investigated consumer price digits before and after the euro introduction for price adjustments.

  5. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    1 troy ounce of four nines fine gold (999.9) Nines are an informal logarithmic notation for proportions very near to one or, equivalently, percentages very near 100%. Put simply, "nines" are the number of consecutive nines in a percentage such as 99% (two nines) [1] or a decimal fraction such as 0.999 (three nines).

  6. Odds ratio - Wikipedia

    en.wikipedia.org/wiki/Odds_ratio

    The sample odds ratio n 11 n 00 / n 10 n 01 is easy to calculate, and for moderate and large samples performs well as an estimator of the population odds ratio. When one or more of the cells in the contingency table can have a small value, the sample odds ratio can be biased and exhibit high variance .

  7. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.

  8. List of countries by tariff rate - Wikipedia

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

    Global map of countries by tariff rate, applied, weighted mean, all products (%), 2021, according to World Bank. This is a list of countries by tariff rate. The list includes sovereign states and self-governing dependent territories based upon the ISO standard ISO 3166-1. Import duty refers to taxes levied on imported goods, capital and ...

  9. History of climate change science - Wikipedia

    en.wikipedia.org/wiki/History_of_climate_change...

    Additionally he accurately predicted the rate of global warming for the period between 1972 and 2000. [ 73 ] [ 74 ] The increase of 25% CO2 expected by the end of the century therefore corresponds to an increase of 0.6 °C in the world temperature – an amount somewhat greater than the climatic variation of recent centuries .