{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:49:08Z","timestamp":1760240948429,"version":"build-2065373602"},"reference-count":28,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2019,11,7]],"date-time":"2019-11-07T00:00:00Z","timestamp":1573084800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001807","name":"Funda\u00e7\u00e3o de Amparo \u00e0 Pesquisa do Estado de S\u00e3o Paulo","doi-asserted-by":"publisher","award":["2013\/07375-0"],"award-info":[{"award-number":["2013\/07375-0"]}],"id":[{"id":"10.13039\/501100001807","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>This work aimed to develop business intelligence towards fraud detection using buyer-placed information combined with the sound analysis from a confirmation purchase call. We used a dataset of 789 orders in 2018, provided by different e-commerce websites and calls fulfilled from every Brazilian state. Nine acoustic index features were used, through entropy in sound and vibration, summarizing the audio plus 6 extra features related, added by 12 customer features to compose two different classifiers (Logistic Regression and Random Forest). The acoustic indexes were, in fact, capable of providing better accuracy of the models, showing a probability associated with the voice characteristics, helping decision-making in credit card fraud.<\/jats:p>","DOI":"10.3390\/e21111087","type":"journal-article","created":{"date-parts":[[2019,11,7]],"date-time":"2019-11-07T06:52:36Z","timestamp":1573109556000},"page":"1087","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Risk Management in E-Commerce\u2014A Fraud Study Case Using Acoustic Analysis through Its Complexity"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3406-4518","authenticated-orcid":false,"given":"Diego C.","family":"Nascimento","sequence":"first","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bruno","family":"Barbosa","sequence":"additional","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1963-4981","authenticated-orcid":false,"given":"Andr\u00e9 M.","family":"Perez","sequence":"additional","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel O.","family":"Caires","sequence":"additional","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Edgar","family":"Hirama","sequence":"additional","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5387-2457","authenticated-orcid":false,"given":"Pedro L.","family":"Ramos","sequence":"additional","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7815-9554","authenticated-orcid":false,"given":"Francisco","family":"Louzada","sequence":"additional","affiliation":[{"name":"Institute of Mathematical Science and Computing, University of S\u00e3o Paulo, 13566-590 S\u00e3o Carlos, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,11,7]]},"reference":[{"unstructured":"Bhatla, T.P., Prabhu, V., and Dua, A. 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