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.