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On an inequality for the normal distribution arising in bioequivalence studies
Published online by Cambridge University Press: 14 July 2016
Abstract
For (μ,σ2) ≠ (0,1), and 0 < z < ∞, we prove that
where φ and Φ are, respectively, the p.d.f. and the c.d.f. of a standard normal random variable. This inequality is sharp in the sense that the right-hand side cannot be replaced by a larger quantity which depends only on μ and σ. In other words, for any given (μ,σ) ≠ (0,1), the infimum, over 0 < z < ∞, of the left-hand side of the inequality is equal to the right-hand side. We also point out how this inequality arises in the context of defining individual bioequivalence.
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- Copyright © Applied Probability Trust 1999