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  2. Kelly criterion - Wikipedia

    en.wikipedia.org/wiki/Kelly_criterion

    Example of the optimal Kelly betting fraction, versus expected return of other fractional bets. In probability theory, the Kelly criterion (or Kelly strategy or Kelly bet) is a formula for sizing a sequence of bets by maximizing the long-term expected value of the logarithm of wealth, which is equivalent to maximizing the long-term expected geometric growth rate.

  3. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.

  4. Attributable fraction for the population - Wikipedia

    en.wikipedia.org/wiki/Attributable_fraction_for...

    In epidemiology, attributable fraction for the population (AFp) is the proportion of incidents in the population that are attributable to the risk factor. The term attributable risk percent for the population is used if the fraction is expressed as a percentage. [1]

  5. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    [30] [31] In 1719, Thomas de Lagny used a similar identity to calculate 127 digits (of which 112 were correct). In 1789, the Slovene mathematician Jurij Vega improved John Machin's formula to calculate the first 140 digits, of which the first 126 were correct. [32] In 1841, William Rutherford calculated 208 digits, of which the first 152 were ...

  6. Atomic packing factor - Wikipedia

    en.wikipedia.org/wiki/Atomic_packing_factor

    The primitive unit cell for the body-centered cubic crystal structure contains several fractions taken from nine atoms (if the particles in the crystal are atoms): one on each corner of the cube and one atom in the center. Because the volume of each of the eight corner atoms is shared between eight adjacent cells, each BCC cell contains the ...

  7. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    Or more simply, one can calculate the horizontal run by using the Pythagorean theorem, after which it is trivial to calculate the (standard math) slope or the grade (percentage). In Europe, road gradients are signed as a percentage. [4]

  8. Cloud cover - Wikipedia

    en.wikipedia.org/wiki/Cloud_cover

    Total cloud cover fraction averaged over the years 1981-2010 from the CHELSA-BIOCLIM+ data set [1] Satellite image based largely on observations from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) on July 11, 2005, of Earth's cloud cover.

  9. Preventable fraction among the unexposed - Wikipedia

    en.wikipedia.org/wiki/Preventable_fraction_among...

    In epidemiology, preventable fraction among the unexposed (PFu), is the proportion of incidents in the unexposed group that could be prevented by exposure.It is calculated as = / =, where is the incidence in the exposed group, is the incidence in the unexposed group, and is the relative risk.

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