<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-1751</journal-id>
<journal-title><![CDATA[Revista Colombiana de Estadística]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Estad.]]></abbrev-journal-title>
<issn>0120-1751</issn>
<publisher>
<publisher-name><![CDATA[Departamento de Estadística - Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-17512005000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ajuste de un modelo no lineal a la variable precipitación en una estación hidro-meteorológica de Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Fitting a nonlinear model to the precipitation variable in a Colombian hydrological/meteorological station]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BRIÑEZ]]></surname>
<given-names><![CDATA[ÁNGELA P]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[NIETO]]></surname>
<given-names><![CDATA[FABIO H]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Estadística ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>05</day>
<month>12</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>05</day>
<month>12</month>
<year>2005</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>124</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-17512005000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-17512005000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-17512005000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En la literatura sobre análisis de series temporales, se ha establecido en años recientes que las series hidrológicas y meteorológicas se describen apropiadamente por modelos no lineales, en particular por los modelos SETAR (Self-exciting threshold autoregressive models). Combinamos dos métodos propuestos en la literatura para ajustar un modelo SETAR a datos de precipitación, medida en una estación hidro-meteorológica de Colombia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In the literature on time series analysis it has been established in recent years that the hydrological/meteorological time series are well described by nonlinear models, in particular by the SETAR (Self- exciting threshold autoregressive) models. In this paper, a nonlinear SETAR model is fitted to the precipitation variable that is observed in a certain Colombian hydrological/ meteorological station. In the fitting process, two alternative methodologies, which have been proposed in the literature about nonlinear time series models, are combined.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Modelos SETAR]]></kwd>
<kwd lng="es"><![CDATA[series de tiempo no lineales]]></kwd>
<kwd lng="es"><![CDATA[precipitación]]></kwd>
<kwd lng="en"><![CDATA[SETAR models]]></kwd>
<kwd lng="en"><![CDATA[Nonlinear Time Series]]></kwd>
<kwd lng="en"><![CDATA[Precipitation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="verdana">        <p>    <center><b><font size="4">Ajuste de un modelo no lineal a la variable  precipitaci&oacute;n en una estaci&oacute;n hidro-meteorol&oacute;gica de Colombia</font></b></center></p>        <p>    <center><b><font size="3">Fitting a nonlinear model to the precipitation variable in a Colombian  hydrological/meteorological station</font></b></center></p>        <p>    <center>&Aacute;NGELA P. BRI&Ntilde;EZ<sup>1</sup>, FABIO H. NIETO<sup>2</sup></center></p>        <p><sup>1</sup>Estad&iacute;stica de la Universidad Nacional de Colombia. E-mail:<a href="mailto:apbrinezr@unal.edu.co">apbrinezr@unal.edu.co</a>    <br>  <sup>2</sup>Profesor Titular, Departamento de Estad&iacute;stica de la Universidad Nacional de Colombia.  E-mail: <a href="mailto:fhnietos@unal.edu.co">fhnietos@unal.edu.co</a></p>    <hr size="1">        <p>    ]]></body>
<body><![CDATA[<center><b>Resumen</b></center></p>        <p>En la literatura sobre an&aacute;lisis de series temporales, se ha establecido en  a&ntilde;os recientes que las series hidrol&oacute;gicas y meteorol&oacute;gicas se describen apropiadamente  por modelos no lineales, en particular por los modelos SETAR  (Self-exciting threshold autoregressive models). Combinamos dos m&eacute;todos  propuestos en la literatura para ajustar un modelo SETAR a datos de precipitaci  &oacute;n, medida en una estaci&oacute;n hidro-meteorol&oacute;gica de Colombia.</p>        <p><b><i>Palabras Clave:</i></b> Modelos SETAR, series de tiempo no lineales, precipitaci  &oacute;n</p>    <hr size="1">        <p>    <center><b>Abstract</b></center></p>        <p>In the literature on time series analysis it has been established in recent  years that the hydrological/meteorological time series are well described by  nonlinear models, in particular by the SETAR (Self- exciting threshold autoregressive)  models. In this paper, a nonlinear SETAR model is fitted to  the precipitation variable that is observed in a certain Colombian hydrological/  meteorological station. In the fitting process, two alternative methodologies,  which have been proposed in the literature about nonlinear time series  models, are combined.</p>        <p><b><i>Keywords:</i></b> SETAR models, Nonlinear Time Series, Precipitation</p>    <hr size="1">        <p>Texto completo disponible en <a href="pdf/rce/v28n2/v28n2a01.pdf">PDF</a></p>    <hr size="1">        <p><b><font size="3">Referencias</font></b></p>        <!-- ref --><p>1. Gomez, V. &amp; Maravall, A. (1996), <i>Programs TRAMO and SEATS: Instructions  for the user</i>, Banco de Espa&ntilde;a-Servicio de estudios, Madrid.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000022&pid=S0120-1751200500020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Nieto, F. (2002), <i>Interpolation of nonlinear TAR models</i>., Unidad de Investigaci&oacute;n,  Departamento de Estad&iacute;stica, Universidad Nacional de Colombia, Bogot&aacute;.  Reporte Interno No. 1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000023&pid=S0120-1751200500020000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3. Nieto, F. &amp; Ruiz, F. (2002), &quot;About a prompt strategy for estimating missing data  in long time series&quot;, <i>Revista de la Academia Colombiana de Ciencias Exactas,  F&iacute;sicas y Naturales</i> <b>100</b>(26), 411- 418.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000024&pid=S0120-1751200500020000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>4. Tong, H. (1990), <i>Nonlinear Time Series, A Dynamical System Approach</i>, Oxford  University Press, Oxford.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000025&pid=S0120-1751200500020000100004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>5. Tsay, R. S. (1989), &quot;Testing and modeling threshold autoregressive processes&quot;,  <i>Journal of the American Statistical Association</i> <b>84</b>, 231- 240.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000026&pid=S0120-1751200500020000100005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
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</article>
