Conversely, the Clopper-Pearson Exact method is very conservative and tends to produce wider intervals than necessary. The Wald interval often has inadequate coverage, particularly for small n and values of p close to 0 or 1. "Agresti-Coull" (adjusted Wald) interval and.Binomial (Clopper-Pearson) "exact" method based on the beta distribution.Asymptotic (Wald) method based on a normal approximation. The program outputs the estimated proportion plus upper and lower limits of the specified confidence interval, using 5 alternative calculation methods decribed and discussed in Brown, LD, Cat, TT and DasGupta, A (2001). Inputs are the sample size and number of positive results, the desired level of confidence in the estimate and the number of decimal places required in the answer. This utility calculates confidence limits for a population proportion for a specified level of confidence.
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