Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterizing player's playing styles based on Player Vectors for each
  playing position in the Chinese Football Super League   Characterizing playing style is important for football clubs on scouting,
monitoring and match preparation. Previous studies considered a player's style
as a combination of technical performances, failing to consider the spatial
information. Therefore, this study aimed to characterize the playing styles of
each playing position in the Chinese Football Super League (CSL) matches,
integrating a recently adopted Player Vectors framework. Data of 960 matches
from 2016-2019 CSL were used. Match ratings, and ten types of match events with
the corresponding coordinates for all the lineup players whose on-pitch time
exceeded 45 minutes were extracted. Players were first clustered into 8
positions. A player vector was constructed for each player in each match based
on the Player Vectors using Nonnegative Matrix Factorization (NMF). Another NMF
process was run on the player vectors to extract different types of playing
styles. The resulting player vectors discovered 18 different playing styles in
the CSL. Six performance indicators of each style were investigated to observe
their contributions. In general, the playing styles of forwards and midfielders
are in line with football performance evolution trends, while the styles of
defenders should be reconsidered. Multifunctional playing styles were also
found in high rated CSL players.

19
The categories of this paper are: eess
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
9
The categories of this paper are: nlin