Lognormal Distribution

If a random variable has a Lognormal distribution, then its natural logarithm has a Normal distribution. This is the meaning of the term Lognormal.

Like the Exponential distribution, the Lognormal distribution can only be used for variables which are always positive.

A Lognormal distribution can be used for modeling variables which have a peak in the distribution near zero, and then gradually decrease for larger values. For joint networks, this may be useful for modeling joint length, spacing or persistence.

Lognormal probability density functions