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However, two significant issues arise: there may be considerable interest in identifying specific structures within the novelty, and contamination in the known classes could completely blur the actual separation between manifest and new groups. Motivated by these problems, we propose a two-stage Bayesian semiparametric novelty detector, building upon prior information robustly extracted from a set of complete learning units. We devise a general-purpose multivariate methodology that we also extend to handle functional data objects. We provide insights on the model behavior by investigating the theoretical properties of the associated semiparametric prior. From the computational point of view, we propose a suitable\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\varvec{\\xi }$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>\u03be<\/mml:mi>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    -sequence to construct an independent slice-efficient sampler that takes into account the difference between manifest and novelty components. We showcase our model performance through an extensive simulation study and applications on both multivariate and functional datasets, in which diverse and distinctive unknown patterns are discovered.\n                  <\/jats:p>","DOI":"10.1007\/s11222-021-10017-7","type":"journal-article","created":{"date-parts":[[2021,5,25]],"date-time":"2021-05-25T00:48:50Z","timestamp":1621903730000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A two-stage Bayesian semiparametric model for novelty detection with robust prior information"],"prefix":"10.1007","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2978-4702","authenticated-orcid":false,"given":"Francesco","family":"Denti","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9348-710X","authenticated-orcid":false,"given":"Andrea","family":"Cappozzo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2929-1748","authenticated-orcid":false,"given":"Francesca","family":"Greselin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,5,25]]},"reference":[{"issue":"3","key":"10017_CR1","doi-asserted-by":"publisher","first-page":"581","DOI":"10.1111\/1467-9469.00350","volume":"30","author":"C Abraham","year":"2003","unstructured":"Abraham, C., Cornillon, P.A., Matzner-L\u00f8ber, E., Molinari, N.: Unsupervised curve clustering using B-splines. 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