Local Conditional Sufficiency
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Summary The concept of sufficiency can be examined locally for a neighbourhood of a parameter point θ0 and it leads to an estimate that has minimum variance among locally-unbiased estimates (Fraser, 1964). This local estimate generates the natural global estimate for the case of the simple exponential model, but it does not do so for the important case of the general translation model. The global estimate, the Pitman estimate, for this translation model is rooted in ancillarity and conditional sufficiency. In this paper the concept of local conditional sufficiency is developed; the asymptotic distribution of the conditionally-sufficient statistic is investigated for large samples; and for the maximum-likelihood estimate a conditional large-sample variance is obtained which differs from that usually used.