Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Scale-Consistent Approach for Recommender Systems   In this paper we propose and develop a relatively simple and efficient
approach for estimating unknown elements of a user-rating matrix in the context
of a recommender system (RS). The critical theoretical property of the method
is its consistency with respect to arbitrary units implicitly adopted by
different users to construct their quantitative ratings of products. It is
argued that this property is needed for robust performance accuracy across a
broad spectrum of RS application domains.

17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex