Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inferences in a Virtual Community: Demography, User Preferences, and
  Network Topology   This paper presents a computational procedure for extracting demography data,
mining patterns of human preferences, and measuring the topology of a virtual
network. The network was created from the personal and relationships data of an
online Internet-based community, where persons are considered nodes in the
network, and relationships between persons are considered edges. A community of
Friendster users whose listed hometown is Los Ba\~nos, Laguna was used as a
test bed for the methodology. The method was able to provide the following
demographic, preferential, and topological results about the test bed: (1)
There are more female users (52.34\%) than male (47.66\%); (2) Homophily (i.e.,
birds-of-a-feather adage) is observed in the preferences of users with respect
to age levels, such that they are strongly biased towards being friends with
users of a similar age; (3) There is heterophily in gender preference such that
friendship among users of the opposite gender occurs more often. (4) It
exhibits a small-world characteristic with an average path length of 4.5
(maximum=12) among connected users, shorter than the well-known {\em six
degrees of separation}~\cite{travers69}; And (5) The network exhibits a
scale-free characteristics with heavily-tailed power-law distribution (with the
power $\lambda = -1.02$ and $R^2 = 0.84$) suggesting the presence of many users
acting as the network hubs. The methodology was successful in providing
important data from a virtual community which can be used by several
researchers in the fields of statistics, mathematics, physics, social sciences,
and computer science.

4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat