Osband’s principle for identification functions

Statistische Hefte - Trang 1-8 - 2023
Timo Dimitriadis1,2, Tobias Fissler3,4, Johanna Ziegel5
1Alfred Weber Institute of Economics, Heidelberg University, Heidelberg, Germany
2Heidelberg Institute for Theoretical Studies, Heidelberg, Germany
3Department of Finance, Accounting and Statistics, Vienna University of Economics and Business (WU), Vienna, Austria
4RiskLab, Department of Mathematics, ETH Zurich, Zurich, Switzerland
5Department of Mathematics and Statistics, Institute of Mathematical Statistics and Actuarial Science, University of Bern, Bern, Switzerland

Tóm tắt

Given a statistical functional of interest such as the mean or median, a (strict) identification function is zero in expectation at (and only at) the true functional value. Identification functions are key objects in forecast validation, statistical estimation and dynamic modelling. For a possibly vector-valued functional of interest, we fully characterise the class of (strict) identification functions subject to mild regularity conditions.

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