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Topp-Leone Odd Fréchet Generated Family of Distributions with Applications to COVID-19 Data Sets

Sanaa Al-Marzouki1, Farrukh Jamal2, Christophe Chesneau3,*, Mohammed Elgarhy4

1 Statistics Department, Faculty of Science, King AbdulAziz University, Jeddah, 21551, Saudi Arabia
2 Department of Statistics, Govt. S.A Postgraduate College Dera Nawab Sahib, Bahawalpur, 63100, Pakistan
3 Université de Caen Normandie, LMNO, Campus II, Science 3, Caen, 14032, France
4 Valley High Institute for Management Finance and Information Systems, Obour, 11828, Egypt

* Corresponding Author: Christophe Chesneau. Email:

(This article belongs to this Special Issue: Computer Modelling of Transmission, Spread, Control and Diagnosis of COVID-19)

Computer Modeling in Engineering & Sciences 2020, 125(1), 437-458.


Recent studies have pointed out the potential of the odd Fréchet family (or class) of continuous distributions in fitting data of all kinds. In this article, we propose an extension of this family through the so-called “Topp-Leone strategy”, aiming to improve its overall flexibility by adding a shape parameter. The main objective is to offer original distributions with modifiable properties, from which adaptive and pliant statistical models can be derived. For the new family, these aspects are illustrated by the means of comprehensive mathematical and numerical results. In particular, we emphasize a special distribution with three parameters based on the exponential distribution. The related model is shown to be skillful to the fitting of various lifetime data, more or less heterogeneous. Among all the possible applications, we consider two data sets of current interest, linked to the COVID-19 pandemic. They concern daily cases confirmed and recovered in Pakistan from March 24 to April 28, 2020. As a result of our analyzes, the proposed model has the best fitting results in comparison to serious challengers, including the former odd Fréchet model.


Cite This Article

Al-Marzouki, S., Jamal, F., Chesneau, C., Elgarhy, M. (2020). Topp-Leone Odd Fréchet Generated Family of Distributions with Applications to COVID-19 Data Sets. CMES-Computer Modeling in Engineering & Sciences, 125(1), 437–458.


This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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