Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Are Instrumental Variables Really That Instrumental? Endogeneity
  Resolution in Regression Models for Comparative Studies   We provide a justification for why, and when, endogeneity will not cause bias
in the interpretation of the coefficients in a regression model. This technique
can be a viable alternative to, or even used alongside, the instrumental
variable method. We show that when performing any comparative study, it is
possible to measure the true change in the coefficients under a broad set of
conditions. Our results hold, as long as the product of the covariance
structure between the explanatory variables and the covariance between the
error term and the explanatory variables are equal, within the same system at
different time periods or across multiple systems at the same point in time.

19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex