The iterative calculations required to obtain the maximum likelihood estimates of α and β in the distribution functiondF(z) =ez/(1 +ez)2dz, wherez= α +βx, are presented for doubly truncated, upper and lower truncated, and untruncated grouped samples. The calculations needed to obtain the maximum likelihood estimator of Pareto's constant are also given for a lower truncated grouped sample with both equal and unequal grouping. Asymptotic variances and covariances are derived for all estimators considered.