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  2. 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).

  3. 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.

  4. 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 ...

  5. Chi-squared distribution - Wikipedia

    en.wikipedia.org/wiki/Chi-squared_distribution

    Because the square of a standard normal distribution is the chi-squared distribution with one degree of freedom, the probability of a result such as 1 heads in 10 trials can be approximated either by using the normal distribution directly, or the chi-squared distribution for the normalised, squared difference between observed and expected value.

  6. Rate of return - Wikipedia

    en.wikipedia.org/wiki/Rate_of_return

    This is a return of US$20,000 divided by US$100,000, which equals 20 percent. The US$20,000 is paid in 5 irregularly-timed installments of US$4,000, with no reinvestment, over a 5-year period, and with no information provided about the timing of the installments.

  7. Wealth distribution by country - Wikipedia

    en.wikipedia.org/wiki/Wealth_distribution_by_country

    Percent of world net worth (PPP) Percent of world net worth (exchange rates) Real GDP per capita (PPP) Real GDP per capita (exchange rates) Percent of world GDP (PPP) Percent of world GDP (exchange rates) United States: 4.67 71.39 143,727 143,727 25.4 32.65 35,619 35,619 21.97 31.49 Canada: 0.5 74.18 89,252 70,916 1.7 1.74 28,731 22,828 1.91 2. ...

  8. List of countries by government budget - Wikipedia

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

    According to Central Intelligence Agency, "budget surplus (+) or deficit (-) records the difference between national government revenues and expenditures, expressed as a percent of GDP. A positive (+) number indicates that revenues exceeded expenditures (a budget surplus), while a negative (-) number indicates the reverse (a budget deficit).

  9. 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 ...