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Generalized Gamma Distribution with Threshold

    Probability Density Function (PDF)
      EXPFORECASTStep3
    Cumulative Distribution Function (CDF)
      EXPFORECASTStep3
    where 𝛤(𝛽) is the Gamma function and 𝛾(𝑘, 𝑧) is the lower incomplete Gamma function.
    Range 0 ≤ 𝑥 - 𝜃 < ∞
    Scale Parameter 𝛼 > 0
    Shape1 parameter 𝑘 > 0
    Shape1 parameter 𝑝 > 0
    Threshold parameter 𝜃 < 𝑚𝑖𝑛(𝑥)

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