Because censored sampling is often unavoidable in much sociological data analysis, computationally simple corrections of censoring bias would be useful. Heckman's correction is simple to compute, widely used, and proven asymptotically correct under certain assumptions, but its limitations in...

How much of the world's oil and energy supply will the non-OPEC less developed countries (NOLDCs) demand in the next decade? Will their requirements be small and thus fairly insignificant compared with world demand, or large and relatively important? How will world demand be affected by the...