Survival Probability, R(t)

Likelihood of the continued functioning of an item, as given by Equation (1):
R(t ) = Pr (T > t )         (1)
where Pr is the probability that T, the time to failure of an item, is greater than t, a time equal to or greater than 0.

Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global Standards

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