Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A longitudinal dataset of five years of public activity in the Scratch
  online community   Scratch is a programming environment and an online community where young
people can create, share, learn, and communicate. In collaboration with the
Scratch Team at MIT, we created a longitudinal dataset of public activity in
the Scratch online community during its first five years (2007-2012). The
dataset comprises 32 tables with information on more than 1 million Scratch
users, nearly 2 million Scratch projects, more than 10 million comments, more
than 30 million visits to Scratch projects, and more. To help researchers
understand this dataset, and to establish the validity of the data, we also
include the source code of every version of the software that operated the
website, as well as the software used to generate this dataset. We believe this
is the largest and most comprehensive downloadable dataset of youth programming
artifacts and communication.

21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics