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2024年9月5日 · Fracking (also known as hydraulic fracturing, fracing, hydrofracturing, or hydrofracking) is a well stimulation technique involving the fracturing of formations in bedrock by a pressurized liquid.
3 天前 · In statistics, the Pearson correlation coefficient (PCC) [a] is a correlation coefficient that measures linear correlation between two sets of data.
2024年9月5日 · Definition. The variance of a random variable is the expected value of the squared deviation from the mean of , : This definition encompasses random variables that are generated by processes that are discrete, continuous, neither, or mixed. The variance can also be thought of as the covariance of a random variable with itself:
6 天前 · In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.
2 天前 · PPP largely removes the exchange rate problem but not others; it does not reflect the value of economic output in international trade, and it also requires more estimation than GDP per capita. On the whole, PPP per capita figures are more narrowly spread than nominal GDP per capita figures.
2024年9月4日 · Mode. Usually the mode of a binomial B (n, p) distribution is equal to , where is the floor function. However, when (n + 1) p is an integer and p is neither 0 nor 1, then the distribution has two modes: (n + 1) p and (n + 1) p − 1. When p is equal to 0 or 1, the mode will be 0 and n correspondingly.
2 天前 · James Warren Jones (May 13, 1931 – November 18, 1978) was an American cult leader and mass murderer who led the Peoples Temple between 1955 and 1978. In what Jones termed "revolutionary suicide", Jones and the members of his inner circle planned and orchestrated a mass murder-suicide in his remote jungle commune at Jonestown ...
