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  2. Economics of Christmas - Wikipedia

    en.wikipedia.org/wiki/Economics_of_Christmas

    The "Christmas Price Index" is calculated by adding the cost of the items in the song. The "True Cost of Christmas," however, is calculated by buying a partridge in a pear tree on each of the twelve days, buying two turtle doves from the second day onward, for a total of 22 turtle doves, etc., for the complete set of 364 items. [33]

  3. Effect size - Wikipedia

    en.wikipedia.org/wiki/Effect_size

    In statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that quantity. It can refer to the value of a statistic calculated from a sample of data, the value of one parameter for a hypothetical population, or to the equation that operationalizes how statistics or parameters lead to the effect size ...

  4. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Engineer using a slide rule, with mechanical calculator in background, mid 20th century. A more modern form of slide rule was created in 1859 by French artillery lieutenant Amédée Mannheim, who was fortunate both in having his rule made by a firm of national reputation, and its adoption by the French Artillery. Mannheim's rule had two major ...

  5. Statistical hypothesis test - Wikipedia

    en.wikipedia.org/wiki/Statistical_hypothesis_test

    The above image shows a table with some of the most common test statistics and their corresponding tests or models.. A statistical hypothesis test is a method of statistical inference used to decide whether the data sufficiently supports a particular hypothesis.

  6. Nassim Nicholas Taleb - Wikipedia

    en.wikipedia.org/wiki/Nassim_Nicholas_Taleb

    Nassim Nicholas Taleb [a] (/ ˈ t ɑː l ə b /; alternatively Nessim or Nissim; born 12 September 1960) is a Lebanese-American essayist, mathematical statistician, former option trader, risk analyst, and aphorist.

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  8. Tree girth measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_girth_measurement

    Photographs of trees can be used to determine girth or other measurements if there is a something of known size in the photo to provide a scale. The following information must be known to approximate the measurements: 1) distance of the camera from the tree, 2) distance from the camera to the scale, and 3) size of the object to be used as a scale.

  9. Pixel density - Wikipedia

    en.wikipedia.org/wiki/Pixel_density

    Since most digital hardware devices use dots or pixels, the size of the media (in inches) and the number of pixels (or dots) are directly related by the 'pixels per inch'. The following formula gives the number of pixels, horizontally or vertically, given the physical size of a format and the pixels per inch of the output: