乐胖代购免代理版

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$$f :\\mathbb {R}^d \\rightarrow \\mathbb {R}$$<\/jats:tex-math>\n \n f<\/mml:mi>\n :<\/mml:mo>\n \n \n R<\/mml:mi>\n <\/mml:mrow>\n d<\/mml:mi>\n <\/mml:msup>\n \u2192<\/mml:mo>\n R<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>. However, in many applications this minimization problem cannot be solved exactly, and instead, a numerical method which computes an approximate minimum over a suitable subfamily of Borel functions has to be used. The quality of the result depends on the adequacy of the subfamily and the performance of the numerical method. In this paper, we derive an expected value representation of the minimal mean squared distance which in many applications can efficiently be approximated with a standard Monte Carlo average. This enables us to provide guarantees for the accuracy of any numerical approximation of a given conditional expectation. We illustrate the method by assessing the quality of approximate conditional expectations obtained by linear, polynomial and neural network regression in different concrete examples.\n<\/jats:p>","DOI":"10.1007\/s10915-023-02130-8","type":"journal-article","created":{"date-parts":[[2023,2,17]],"date-time":"2023-02-17T09:10:41Z","timestamp":1676625041000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Computation of Conditional Expectations with Guarantees"],"prefix":"10.1007","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9074-7295","authenticated-orcid":false,"given":"Patrick","family":"Cheridito","sequence":"first","affiliation":[]},{"given":"Balint","family":"Gersey","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,2,17]]},"reference":[{"key":"2130_CR1","doi-asserted-by":"publisher","first-page":"1487","DOI":"10.1016\/S0378-4266(02)00283-2","volume":"26","author":"C Acerbi","year":"2002","unstructured":"Acerbi, C., Tasche, D.: On the coherence of expected shortfall. 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