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Reversion to the mean

Reversion to the mean, also called regression to the mean, is the statistical phenomenon stating that the greater the deviation of a random variate from its mean, the greater the probability that the next measured variate will deviate less far. In other words, an extreme event is likely to be followed by a less extreme event.Although this phenomenon appears to violate the definition of independent events, it simply reflects the fact that the probability density function of any random variable , by definition, is nonnegative over every interval and integrates to one over the interval . Thus, as you move away from the mean, the proportion of the distribution that lies closer to the mean than you do increases continuously. Formally,for .The Season 1 episode "Sniper Zero" (2005) of the television crime drama NUMB3RS mentions regression to the mean. ..

Life expectancy

An table is a tabulation of numbers which is used to calculate life expectancies.010002001.000.200.902.702.7018001000.800.120.751.802.2527002000.700.290.601.051.5035003000.500.600.350.450.9042002000.201.000.100.100.505000.00--0.000.00--10002.70: Age category (, 1, ..., ). These values can be in any convenient units, but must be chosen so that no observed lifespan extends past category . : Census size, defined as the number of individuals in the study population who survive to the beginning of age category . Therefore, (the total population size) and . : ; . Crude death rate, which measures the number of individuals who die within age category . : . Survivorship, which measures the proportion of individuals who survive to the beginning of age category . : ; . Proportional death rate, or "risk," which measures the proportion of individuals surviving to the beginning of age category who die within that category...

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