Log Normal Distribution

Log Normal Statistical Distribution


General Characteristics

  • Log Normal distribution is also referred to as Gibrat distribution, Galton’s distribution, McAlister distribution or Cobb-Douglas distribution.
  • A positive variable X is Log-Normally distributed if its Logarithm is normally distributed.



Specific Characteristics

Key Measures:

Location, Spread


Range of values:

0 < x < ∞



Mean = e ^ (location + (spread /2))


Standard Deviation, SD:

SD = √[(e^((2location) + spread)) * ((e^(spread)) – 1)]



Log Normal distributions can be used to calculate the time required to complete a task.

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Log Normal Statistical Distribution – Statistical Distributions
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