Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Overton -- A bibliometric database of policy document citations   This paper presents an analysis of the Overton policy document database,
describing the makeup of materials indexed and the nature in which they cite
academic literature. We report on various aspects of the data, including
growth, geographic spread, language representation, the range of policy source
types included, and the availability of citation links in documents.
Longitudinal analysis over established journal category schemes is used to
reveal the scale and disciplinary focus of citations and determine the
feasibility of developing field-normalized citation indicators. We examine how
well self-reported funding outcomes collected by UK funders corresponds to data
indexed in the Overton database, and if peer-review assessment of impact as
measured by the UK Research Excellence Framework (REF) 2014 correlates with
derived citation metrics. Our findings show that for some research topics, such
as health, economics, social care and the environment, Overton contains a core
set of policy documents with sufficient citation linkage to academic literature
to support various citation analysis that may be informative in research
evaluation, impact assessment, and policy review. The data indexed in Overton
agrees with that collected via self-reporting of funding outcomes, and
correlates with peer-review assessment of impact in some disciplines.

11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys