LogNormal Distribution

The LogNormal distribution is a continuous probability distribution. It models a broad range of random variables, whose logarithm is normally distributed.

The LogNormal distribution has two parameters:

  • Parameter 1 is the expected value or mean .

  • Parameter 2 is the standard deviation of the natural log.

The example below shows the probability density function for 3 LogNormal distributions. Each distribution has a parameter 1 value of 1.0 and a range of parameter 2 values from 0.25 to 1.0.

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