12,211 research outputs found
The Decision of Work and Study and Employment Outcomes
The paper studies factors that contribute to student's work study decision while attending postsecondary institutions using SLID and YITS data. It further tests that how the work decision can affect their future employment outcomes.postsecondary eduction;labour supply decisions;return to schooling
Tail Asymptotics of Deflated Risks
Random deflated risk models have been considered in recent literatures. In
this paper, we investigate second-order tail behavior of the deflated risk X=RS
under the assumptions of second-order regular variation on the survival
functions of the risk R and the deflator S. Our findings are applied to
approximation of Value at Risk, estimation of small tail probability under
random deflation and tail asymptotics of aggregated deflated riskComment: 2
Inference for a Special Bilinear Time Series Model
It is well known that estimating bilinear models is quite challenging. Many
different ideas have been proposed to solve this problem. However, there is not
a simple way to do inference even for its simple cases. This paper studies the
special bilinear model where is a sequence of i.i.d. random
variables with mean zero. We first give a sufficient condition for the
existence of a unique stationary solution for the model and then propose a
GARCH-type maximum likelihood estimator for estimating the unknown parameters.
It is shown that the GMLE is consistent and asymptotically normal under only
finite fourth moment of errors. Also a simple consistent estimator for the
asymptotic covariance is provided. A simulation study confirms the good finite
sample performance. Our estimation approach is novel and nonstandard and it may
provide a new insight for future research in this direction.Comment: 23 pages, 1 figures, 3 table
Holographic Butterfly Effect at Quantum Critical Points
When the Lyapunov exponent in a quantum chaotic system saturates
the bound , it is proposed that this system has a
holographic dual described by a gravity theory. In particular, the butterfly
effect as a prominent phenomenon of chaos can ubiquitously exist in a black
hole system characterized by a shockwave solution near the horizon. In this
paper we propose that the butterfly velocity can be used to diagnose quantum
phase transition (QPT) in holographic theories. We provide evidences for this
proposal with an anisotropic holographic model exhibiting metal-insulator
transitions (MIT), in which the derivatives of the butterfly velocity with
respect to system parameters characterizes quantum critical points (QCP) with
local extremes in zero temperature limit. We also point out that this proposal
can be tested by experiments in the light of recent progress on the measurement
of out-of-time-order correlation function (OTOC).Comment: 7 figures, 15 page
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