Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Control Efficacy on COVID-19   We proposed a Monte-Carlo method to estimate temporal reproduction number
without complete information about symptom onsets of all cases. Province-level
analysis demonstrated the huge success of Chinese control measures on COVID-19,
that is, provinces' reproduction numbers quickly decrease to <1 by just one
week after taking actions.

13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph