Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An extended Rayleigh model: Properties, regression and COVID-19
  application   We define a four-parameter extended Rayleigh distribution, and obtain several
mathematical properties including a stochastic representation. We construct a
regression from the new distribution. The estimation is done by maximum
likelihood. The utility of the new models is proved in two real applications.

13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math