Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Problem in Human Dynamics: Modelling the Population Density of a
  Social Space   Human dynamics and sociophysics suggest statistical models that may explain
and provide us with better insight into social phenomena. Here we tackle the
problem of determining the distribution of the population density of a social
space over time by modelling the dynamics of agents entering and exiting the
space as a birth-death process. We show that, for a simple agent-based model in
which the probabilities of entering and exiting the space depends on the number
of agents currently present in the space, the population density of the space
follows a gamma distribution. We also provide empirical evidence supporting the
validity of the model by applying it to a data set of occupancy traces of a
common space in an office building.

20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom