Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Star graphs induce tetrad correlations: for Gaussian as well as for
  binary variables   Tetrad correlations were obtained historically for Gaussian distributions
when tasks are designed to measure an ability or attitude so that a single
unobserved variable may generate the observed, linearly increasing dependences
among the tasks. We connect such generating processes to a particular type of
directed graph, the star graph, and to the notion of traceable regressions.
Tetrad correlation conditions for the existence of a single latent variable are
derived. These are needed for positive dependences not only in joint Gaussian
but also in joint binary distributions. Three applications with binary items
are given.

31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys