Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analyzing Ozone Concentration by Bayesian Spatio-temporal Quantile
  Regression   Ground level Ozone is one of the six common air-pollutants on which the EPA
has set national air quality standards. In order to capture the spatio-temporal
trend of 1-hour and 8-hour average ozone concentration in the US, we develop a
method for spatio-temporal simultaneous quantile regression. Unlike existing
procedures, in the proposed method, smoothing across the sites is incorporated
within modeling assumptions thus allowing borrowing of information across
locations, an essential step when the number of samples in each location is
low. The quantile function has been assumed to be linear in time and smooth
over space and at any given site is given by a convex combination of two
monotone increasing functions $\xi_1$ and $\xi_2$ not depending on time. A
B-spline basis expansion with increasing coefficients varying smoothly over the
space is used to put a prior and a Bayesian analysis is performed. We analyze
the average daily 1-hour maximum and 8-hour maximum ozone concentration level
data of US and California during 2006-2015 using the proposed method. It is
noted that in the last ten years, there is an overall decreasing trend in both
1-hour maximum and 8-hour maximum ozone concentration level over the most parts
of the US. In California, an overall a decreasing trend of 1-hour maximum ozone
level is observed while no particular overall trend has been observed in the
case of 8-hour maximum ozone level.

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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an