29,156 research outputs found
Sleep Hygiene In Danbury CT: Providing a Resource to Prompt and Initiate Behavior Change
Sleeplessness is a problem encountered frequently in the primary care setting, and often is inappropriately addressed by prescribing pharmacological intervention for indefinite periods of time. This project sought to promote behavioral intervention strategies modeled after CBT-I to address sleep hygiene in patients struggling with their sleep.https://scholarworks.uvm.edu/fmclerk/1363/thumbnail.jp
Stochastic determination of matrix determinants
Matrix determinants play an important role in data analysis, in particular
when Gaussian processes are involved. Due to currently exploding data volumes,
linear operations - matrices - acting on the data are often not accessible
directly but are only represented indirectly in form of a computer routine.
Such a routine implements the transformation a data vector undergoes under
matrix multiplication. While efficient probing routines to estimate a matrix's
diagonal or trace, based solely on such computationally affordable
matrix-vector multiplications, are well known and frequently used in signal
inference, there is no stochastic estimate for its determinant. We introduce a
probing method for the logarithm of a determinant of a linear operator. Our
method rests upon a reformulation of the log-determinant by an integral
representation and the transformation of the involved terms into stochastic
expressions. This stochastic determinant determination enables large-size
applications in Bayesian inference, in particular evidence calculations, model
comparison, and posterior determination.Comment: 8 pages, 5 figure
The Galactic Faraday depth sky revisited
The Galactic Faraday depth sky is a tracer for both the Galactic magnetic
field and the thermal electron distribution. It has been previously
reconstructed from polarimetric measurements of extra-galactic point sources.
Here, we improve on these works by using an updated inference algorithm as well
as by taking into account the free-free emission measure map from the Planck
survey. In the future, the data situation will improve drastically with the
next generation Faraday rotation measurements from SKA and its pathfinders.
Anticipating this, the aim of this paper is to update the map reconstruction
method with the latest development in imaging based on information field
theory. We demonstrate the validity of the new algorithm by applying it to the
Oppermann et al. (2012) data compilation and compare our results to the
previous map.\\ Despite using exactly the previous data set, a number of novel
findings are made: A non-parametric reconstruction of an overall amplitude
field resembles the free-free emission measure map of the Galaxy. Folding this
free-free map into the analysis allows for more detailed predictions. The joint
inference enables us to identify regions with deviations from the assumed
correlations between the free-free and Faraday data, thereby pointing us to
Galactic structures with distinguishably different physics. We e.g. find
evidence for an alignment of the magnetic field within the line of sights along
both directions of the Orion arm.Comment: 16 pages, 15 figure
On Elo based prediction models for the FIFA Worldcup 2018
We propose an approach for the analysis and prediction of a football
championship. It is based on Poisson regression models that include the Elo
points of the teams as covariates and incorporates differences of team-specific
effects. These models for the prediction of the FIFA World Cup 2018 are fitted
on all football games on neutral ground of the participating teams since 2010.
Based on the model estimates for single matches Monte-Carlo simulations are
used to estimate probabilities for reaching the different stages in the FIFA
World Cup 2018 for all teams. We propose two score functions for ordinal random
variables that serve together with the rank probability score for the
validation of our models with the results of the FIFA World Cups 2010 and 2014.
All models favor Germany as the new FIFA World Champion. All possible courses
of the tournament and their probabilities are visualized using a single Sankey
diagram.Comment: 22 pages, 7 figure
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Duration and Risk of Unemployment in Argentina
After a decade of structural reforms, unemployment rates have tripled in Argentina. This paper is concerned with the measurement of unemployment risk and its distribution. We show the importance of considering re-incidence in the measurement of unemployment risk and develop a methodolgy to do that. Our estimates for Argentina show that, though the typical unemployment spell is short, once re-incidence is taken into account, unemployment risk is high, has risen substantially in the last decade and is shared very unequally in the labor force. This counters the established view that unemployment is a small risk, short-duration phenomenon, which arises when re-incidence is not considered.http://deepblue.lib.umich.edu/bitstream/2027.42/39861/3/wp476.pd
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