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This study provides detailed insight into the theory behind the selected TFRs belonging to these classes. Extensive numerical simulations were performed with examples that illustrate the behavior of the analyzed TFR classes in the joint time\u2013frequency domain. The methods were applied both on synthetic and real-life non-stationary signals. The obtained results were assessed with respect to time\u2013frequency concentration (measured by the R\u00e9nyi entropy), instantaneous frequency (IF) estimation accuracy, cross-term presence in the TFRs, and the computational cost of the TFRs. This study gives valuable insight into the advantages and limitations of the analyzed TFRs and assists in selecting the proper distribution when analyzing given non-stationary signals in the time\u2013frequency domain.<\/jats:p>","DOI":"10.3390\/s22103727","type":"journal-article","created":{"date-parts":[[2022,5,15]],"date-time":"2022-05-15T09:48:22Z","timestamp":1652608102000},"page":"3727","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Entropy-Based Concentration and Instantaneous Frequency of TFDs from Cohen\u2019s, Affine, and Reassigned Classes"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5160-3571","authenticated-orcid":false,"given":"David","family":"Ba\u010dnar","sequence":"first","affiliation":[{"name":"Department of Computer Engineering, Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5283-6916","authenticated-orcid":false,"given":"Nicoletta","family":"Saulig","sequence":"additional","affiliation":[{"name":"Department of Engineering, Juraj Dobrila University of Pula, Zagreba\u010dka 30, 52100 Pula, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3793-6852","authenticated-orcid":false,"given":"Irena","family":"Petrijev\u010danin Vuksanovi\u0107","sequence":"additional","affiliation":[{"name":"Ministry of the Interior, 10000 Zagreb, Croatia"},{"name":"Center for Artificial Intelligence and Cybersecurity, University of Rijeka, Radmile Matej\u010di\u0107 2, 51000 Rijeka, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4058-8449","authenticated-orcid":false,"given":"Jonatan","family":"Lerga","sequence":"additional","affiliation":[{"name":"Department of Computer Engineering, Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,13]]},"reference":[{"key":"ref_1","unstructured":"Davier, M., and Hello, P. 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