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  2. Odd–even rationing - Wikipedia

    en.wikipedia.org/wiki/Oddeven_rationing

    Oddeven rationing is a method of rationing in which access to some resource is restricted to some of the population on any given day. In a common example, drivers of private vehicles may be allowed to drive , park, or purchase gasoline on alternating days, according to whether the last digit in their license plate is even or odd .

  3. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    That day corresponded to February 29 in the Julian calendar and to March 11 in the Gregorian calendar. [5] [6] The Swedish conversion to the Gregorian calendar was finally accomplished in 1753, when February 17 was followed by March 1. [5] Artificial calendars may also have 30 days in February. For example, in a climate model the statistics may ...

  4. Nitrogen rule - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_rule

    The nitrogen rule states that organic compounds containing exclusively hydrogen, carbon, nitrogen, oxygen, silicon, phosphorus, sulfur, and the halogens either have (1) an odd nominal mass that indicates an odd number of nitrogen atoms are present or (2) an even nominal mass that indicates an even number of nitrogen atoms in the molecular formula of the neutral compound.

  5. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    If T is odd, add 11. Now let T = 7 − (T mod 7). Count forward T days from the century's anchor day to get the year's anchor day. Applying this method to the year 2005, for example, the steps as outlined would be: T = 5; T = 5 + 11 = 16 (adding 11 because T is odd) T = ⁠ 16 / 2 ⁠ = 8; T = 8 (do nothing since T is even) T = 7 − (8 mod 7 ...

  6. Odds ratio - Wikipedia

    en.wikipedia.org/wiki/Odds_ratio

    An odds ratio (OR) is a statistic that quantifies the strength of the association between two events, A and B. The odds ratio is defined as the ratio of the odds of event A taking place in the presence of B, and the odds of A in the absence of B. Due to symmetry, odds ratio reciprocally calculates the ratio of the odds of B occurring in the presence of A, and the odds of B in the absence of A.

  7. Gnevyshev–Ohl rule - Wikipedia

    en.wikipedia.org/wiki/Gnevyshev–Ohl_rule

    The Pearson correlation coefficients are R=0.91 for even-odd pairs (the left panel) and R=0.41 for odd-even ones (the right panel). The Gnevyshev–Ohl rule ( GO rule ) is an empirical rule according to which the sum of Wolf's sunspot numbers in odd cycles with preceding even cycles (E+O) are highly correlated and the correlation is lower if ...

  8. Nonzero-rule - Wikipedia

    en.wikipedia.org/wiki/Nonzero-rule

    A curve (top) is filled according to two rules: the even-odd rule (left), and the non-zero winding rule (right). In each case an arrow shows a ray from a point P heading out of the curve. In the even-odd case, the ray is intersected by two lines, an even number; therefore P is concluded to be 'outside' the curve.

  9. Parity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Parity_(mathematics)

    Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That is, if the last digit is 1, 3, 5, 7, or 9, then it is odd; otherwise it is even—as the last digit of any even number is 0, 2, 4, 6, or 8.