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Just a note

For a population, γ1 is often defined as σ323/2
  • σ3 is average, or expected, cubed deviation from the mean, μ.
  • σ2 is expected squared deviation from the mean - in other words, the population variance, σ2.
  • Therefore σ21/2 is the population standard deviation, σ, and σ23/2 = σ3
  • So γ1 = σ33