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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">JDS</journal-id>
<journal-title-group><journal-title>Journal of Data Science</journal-title></journal-title-group>
<issn pub-type="epub">1683-8602</issn><issn pub-type="ppub">1680-743X</issn><issn-l>1680-743X</issn-l>
<publisher>
<publisher-name>School of Statistics, Renmin University of China</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">JDS1032</article-id>
<article-id pub-id-type="doi">10.6339/21-JDS1032</article-id>
<article-categories><subj-group subj-group-type="heading">
<subject>Statistical Data Science</subject></subj-group></article-categories>
<title-group>
<article-title>Bayesian Inference for Spatial Count Data that May be Over-Dispersed or Under-Dispersed with Application to the 2016 US Presidential Election</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Yang</surname><given-names>Hou-Cheng</given-names></name><email xlink:href="mailto:hy15e@my.fsu.edu">hy15e@my.fsu.edu</email><xref ref-type="aff" rid="j_jds1032_aff_001">1</xref><xref ref-type="corresp" rid="cor1">∗</xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Bradley</surname><given-names>Jonathan R.</given-names></name><email xlink:href="mailto:jrbradley@fsu.edu">jrbradley@fsu.edu</email><xref ref-type="aff" rid="j_jds1032_aff_001">1</xref><xref ref-type="corresp" rid="cor1">∗</xref>
</contrib>
<aff id="j_jds1032_aff_001"><label>1</label>Department of Statistics, <institution>Florida State University</institution>, Tallahassee, FL, <country>USA</country></aff>
</contrib-group>
<author-notes>
<corresp id="cor1"><label>∗</label>Corresponding author. Email: <ext-link ext-link-type="uri" xlink:href="mailto:hy15e@my.fsu.edu">hy15e@my.fsu.edu</ext-link> or <ext-link ext-link-type="uri" xlink:href="mailto:jrbradley@fsu.edu">jrbradley@fsu.edu</ext-link>.</corresp>
</author-notes>
<pub-date pub-type="ppub"><year>2022</year></pub-date><pub-date pub-type="epub"><day>29</day><month>12</month><year>2021</year></pub-date><volume>20</volume><issue>3</issue><fpage>325</fpage><lpage>337</lpage><supplementary-material id="S1" content-type="archive" xlink:href="jds1032_s001.zip" mimetype="application" mime-subtype="x-zip-compressed">
<caption>
<title>Supplementary Material</title>
<p>The real data and R code needed to reproduce the results in this paper can be found on the supplementary materials.</p>
</caption>
</supplementary-material><history><date date-type="received"><day>30</day><month>8</month><year>2021</year></date><date date-type="accepted"><day>27</day><month>11</month><year>2021</year></date></history>
<permissions><copyright-statement>2022 The Author(s). Published by the School of Statistics and the Center for Applied Statistics, Renmin University of China.</copyright-statement><copyright-year>2022</copyright-year>
<license license-type="open-access" xlink:href="https://creativecommons.org/licenses/by/4.0/">
<license-p>Open access article under the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">CC BY</ext-link> license.</license-p></license></permissions>
<abstract>
<p>We propose a method of spatial prediction using count data that can be reasonably modeled assuming the Conway-Maxwell Poisson distribution (COM-Poisson). The COM-Poisson model is a two parameter generalization of the Poisson distribution that allows for the flexibility needed to model count data that are either over or under-dispersed. The computationally limiting factor of the COM-Poisson distribution is that the likelihood function contains multiple intractable normalizing constants and is not always feasible when using Markov Chain Monte Carlo (MCMC) techniques. Thus, we develop a prior distribution of the parameters associated with the COM-Poisson that avoids the intractable normalizing constant. Also, allowing for spatial random effects induces additional variability that makes it unclear if a spatially correlated Conway-Maxwell Poisson random variable is over or under-dispersed. We propose a computationally efficient hierarchical Bayesian model that addresses these issues. In particular, in our model, the parameters associated with the COM-Poisson do not include spatial random effects (leading to additional variability that changes the dispersion properties of the data), and are then spatially smoothed in subsequent levels of the Bayesian hierarchical model. Furthermore, the spatially smoothed parameters have a simple regression interpretation that facilitates computation. We demonstrate the applicability of our approach using simulated examples, and a motivating application using 2016 US presidential election voting data in the state of Florida obtained from the Florida Division of Elections.</p>
</abstract>
<kwd-group>
<label>Keywords</label>
<kwd>Bayesian inference</kwd>
<kwd>Conway-Maxwell</kwd>
<kwd>count data</kwd>
<kwd>dispersion</kwd>
<kwd>Poisson distribution</kwd>
<kwd>spatial statistics</kwd>
</kwd-group>
<funding-group><award-group><funding-source xlink:href="https://doi.org/10.13039/100000001">NSF</funding-source><award-id>SES-1853099</award-id></award-group><funding-statement>Jonathan Bradley’s research was partially supported by the US National Science Foundation (NSF) grant SES-1853099. </funding-statement></funding-group>
</article-meta>
</front>
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