When applied to mixtures of log-normal distributions, the individual indices are equal: View the MathML source IjTheil=IjMLD=σ2j/2 . But the Theil and MLD indices have distinct expressions for the total mixture, simply because they have different weights: τj τj in first case, pj pj in the second. The τj τj weights of the Theil index are given by View the MathML source τj=pjexp(μj+σ2j/2)/∑pjexp(μj+σ2j/2) .