Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlations and clustering in the trading of members of the London
  Stock Exchange   This paper analyzes correlations in patterns of trading of different members
of the London Stock Exchange. The collection of strategies associated with a
member institution is defined by the sequence of signs of net volume traded by
that institution in hour intervals. Using several methods we show that there
are significant and persistent correlations between institutions. In addition,
the correlations are structured into correlated and anti-correlated groups.
Clustering techniques using the correlations as a distance metric reveal a
meaningful clustering structure with two groups of institutions trading in
opposite directions.

33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: comp-gas
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex