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  2. Division (mathematics) - Wikipedia

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

    For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or ⁠ 20 / 5 ⁠ = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is the quotient.

  3. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    In general, if an increase of x percent is followed by a decrease of x percent, and the initial amount was p, the final amount is p (1 + 0.01 x)(1 − 0.01 x) = p (1 − (0.01 x) 2); hence the net change is an overall decrease by x percent of x percent (the square of the original percent change when expressed as a decimal number).

  4. Chi-squared distribution - Wikipedia

    en.wikipedia.org/wiki/Chi-squared_distribution

    It enters all analysis of variance problems via its role in the F-distribution, which is the distribution of the ratio of two independent chi-squared random variables, each divided by their respective degrees of freedom.

  5. Price elasticity of demand - Wikipedia

    en.wikipedia.org/wiki/Price_elasticity_of_demand

    In other words, it is equal to the absolute value of the first derivative of quantity with respect to price multiplied by the point's price (P) divided by its quantity (Q d). [21] However, the point elasticity can be computed only if the formula for the demand function , Q d = f ( P ) {\displaystyle Q_{d}=f(P)} , is known so its derivative with ...

  6. Emissivity - Wikipedia

    en.wikipedia.org/wiki/Emissivity

    The ratio varies from 0 to 1. The surface of a perfect black body (with an emissivity of 1) emits thermal radiation at the rate of approximately 448 watts per square metre (W/m 2) at a room temperature of 25 °C (298 K; 77 °F). Objects have emissivities less than 1.0, and emit radiation at correspondingly lower rates. [1]

  7. 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 a parameter for a hypothetical population, or to the equation that operationalizes how statistics or parameters lead to the effect size ...

  8. Wealth distribution by country - Wikipedia

    en.wikipedia.org/wiki/Wealth_distribution_by_country

    3.13: 5.69: 4.1: Asia. Distribution of Wealth of Asia in the Year 2000. nation percent of world population share of adult population Net worth per capita (PPP)

  9. Macro social work - Wikipedia

    en.wikipedia.org/wiki/Macro_social_work

    Macro social work is the use of social work skills training and perspective to produce large scale social change or social justice of some kind. [1] Unlike micro or mezzo social work, which deals with individual and small group issues, macro social work aims to address societal problems at their roots; however, it has recently not received the same level of importance.