International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
211. One-sided confidence interval : When T is a function of the observed values, such that q being a population parameter to be estimated, the probability Pr (T * q) or the probability Pr ( T > q) is equal to 1- a (where 1-a is a fixed number, positive and less than 1). The interval from the smallest possible value of q up to T, or the interval between T and the greatest possible value of q is a one- sided (1-q) confidence interval for q. The limit T of the confidence interval is a random variable and as such will assume different values in every sample. In a long series of samples, the relative frequency of cases where the interval includes q would be approximately equal to 1-a.

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