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Inverse Gamma Distribution with Threshold

    Probability Density Function (PDF)
      EXPFORECASTStep3
    Cumulative Distribution Function (CDF)
      EXPFORECASTStep3
    where 𝛤(s) is the gamma function, and 𝛾(s, 𝑥) is the lower incomplete gamma function.
    Range 0 ≤ 𝑥 - 𝜃 < ∞
    Scale parameter 𝛼 > 0
    Shape parameter 𝛽 > 0
    Threshold parameter 𝜃 < min(𝑥)

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