Log Normal Distribution

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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:

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

 

Standard Deviation, SD:

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

 

Application

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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