<div dir="ltr"><div class="gmail_quote gmail_quote_container">Prezados colegas, <br><br><div dir="ltr"><div><div><div><div><font face="arial, sans-serif">A nossa próxima palestra ocorrerá na quarta-feira, </font>19 de NOVEMBRO<font face="arial, sans-serif">, no horário das 15h30 às 17h00, Local: Laboratório de Sistemas Estocásticos (LSE), Sala I-044-B, Centro de Tecnologia - UFRJ.</font></div><div><br></div><div><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px"><font face="arial, sans-serif"><b>Palestrante: </b></font>Guilherme Ludwig (UNICAMP)</p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px"><font face="arial, sans-serif"><span lang="EN-US"><b>Título</b>: </span></font>A non-stationary spatio-temporal covariance model with advection effects for rainfall data</p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px"><font face="arial, sans-serif"><span lang="EN-US"><b>Resumo</b>:<b> </b></span></font>We propose a non-stationary model constructed using a mixture of spatio-temporal covariance models with advection effects (Gupta and Waymire, 1987; Cox and Isham, 1988); namely, models that have larger covariance values along an orientation vector in the spatio-temporal index set, that simulate wind direction and cloud movement. We show that a mixture of such models can allow for wind direction change in data during (estimated) time intervals, unlike classical models that use rigid advection effects. We construct a MCMC procedure for Bayesian estimation, and illustrate the problem with rainfall data from the southeastern region of Brazil. This is a joint work with Pedro Nasevicius Ramos (UNICAMP).</p><p class="MsoNormal" style="margin:0in 0in 8pt;line-height:15.6933px"><br></p></div></div><div><span style="font-family:arial,sans-serif">Mais informações: </span><a href="https://ppge.im.ufrj.br/ciclo-de-palestras-segundo-semestre-de-2025/" style="font-family:arial,sans-serif" target="_blank">https://ppge.im.ufrj.br/ciclo-de-palestras-segundo-semestre-de-2025/</a></div><div><div><div><font face="arial, sans-serif"><br>Organizadores: Maria Eulalia Vares e Widemberg S Nobre</font></div><div><font face="arial, sans-serif"><br></font></div><div><font face="arial, sans-serif">Atenciosamente,</font></div></div></div></div><font color="#888888"><div><br></div></font></div><div><br></div></div>
</div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Maria Eulalia Vares<div>Professora Titular - Instituto de Matemática - UFRJ</div><div>Coordenadora do Programa de Pós-Graduação em Estatística</div><div><a href="https://ppge.im.ufrj.br/" target="_blank">https://ppge.im.ufrj.br/</a></div><div><br></div></div></div></div>