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The study empirically estimates the relative technical efficiency of Nigeria upstream petroleum industries and its determinants using non-parametric and parametric analysis. The non-parametric analysis' results reveal that joint venture contract operators, marginal field contract operators, sole risk contract operators, production sharing contract operators, service contract operator and national oil company contract have the following technical efficiency grades: 75%, 67%, 65%, 64%, 42% anddoi:10.1080/23311916.2019.1575638 fatcat:goab264sy5b6nbspfbghbtsu2q