Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stationary random fields with linear regressions   We analyze certain stationary fields with linear regressions and quadratic
conditional variances. This classic probabilistic problem leads somewhat
unexpectedly to stationary Markov processes closely tied to non-commutative
probability through the q-Hermite polynomials.

35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin