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HalfNormalDistribution

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represents a half-normal distribution with parameter theta.

HalfNormalDistribution[θ]
HalfNormalDistribution[1] → HalfNormalDistribution[1]Mean[HalfNormalDistribution[a]] → a^(-1)Variance[HalfNormalDistribution[a]] → (-2 + Pi)/(2*a^2)Median[HalfNormalDistribution[a]] → (Sqrt[Pi]*InverseErf[1/2])/a

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