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The gamma distribution provides an adequate fit for multiple types of pedigrees. For example, HRP UT-549917 has k = 4.4 and σ = 3.6 with good visual density (a) and CDF (b) fit, with λ = 0.9. (Goodness of fit was estimated with λ, the median of empirical chi-squared distribution divided by the median of the expected chi-squared distribution.) HRP UT-34955 has k = 2.8 and σ = 2.9 with good visual density (c) and CDF (d) fit, with λ = 1.0.
