<?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>S0120-17512008000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Distribución predictiva bayesiana para modelos de pruebas de vida vía MCMC]]></article-title>
<article-title xml:lang="en"><![CDATA[The Bayesian Predictive Distribution in Life Testing Models via MCMC]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BARRERA]]></surname>
<given-names><![CDATA[CARLOS JAVIER]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[CORREA]]></surname>
<given-names><![CDATA[JUAN CARLOS]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Tecnológico Metropolitano Institución Universitaria (ITM) Facultad de Ciencias Básicas ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Escuela de Estadística]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>31</volume>
<numero>2</numero>
<fpage>145</fpage>
<lpage>155</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-17512008000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-17512008000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-17512008000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En el estudio de la confiabilidad es muy frecuente el desconocimiento de parámetros poblacionales; por tanto, es necesario recoger información muestral relevante para la estimación de estos a través de distribuciones de probabilidad, conocidas como distribución a priori. Los métodos bayesianos permiten incorporar opiniones subjetivas acerca de incertidumbres con respecto al parámetro o vector de parámetros de interés. La incertidumbre acerca del verdadero valor de un parámetro de interés &theta; en la población es modelada por la función de densidad a priori &pi;(&theta;), (&theta; \in &Theta;). Para obtener las distribuciones predictivas bayesianas, se implementará la metodología MCMC, la cual exige calibración, diseño, implementación y validación de algoritmos apropiados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In reliability studies it is common to not know the population parameters, therefore, it becomes necessary to collect a sample in order to estimate the parameters of the assumed probability distribution. Bayesian methods allow to incorporate subjective information about uncertainties regarding the parameter or parameters of interest. From the bayesian point of view, the uncertainty about the true value of a parameter of interest &theta; in the population, is modeled by the prior density function &pi;(&theta;), (&theta;\in&Theta;). We will implement the methodology MCMC to obtain the predictive bayesian distributions, which requires the calibration, design, implementation, in addition to the validation of appropriate algorithms.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[a priori]]></kwd>
<kwd lng="es"><![CDATA[distribución predictiva]]></kwd>
<kwd lng="es"><![CDATA[fiabilidad]]></kwd>
<kwd lng="es"><![CDATA[MCMC]]></kwd>
<kwd lng="en"><![CDATA[Prior]]></kwd>
<kwd lng="en"><![CDATA[Predictive Distribution]]></kwd>
<kwd lng="en"><![CDATA[Reliability]]></kwd>
<kwd lng="en"><![CDATA[MCMC]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">      <p> <b> <font size="4">     <center> Distribuci&oacute;n predictiva bayesiana para modelos de pruebas de vida v&iacute;a MCMC </center> </font> </b> </p>      <p> <b> <font size="3">     <center> The Bayesian Predictive Distribution in Life Testing Models via MCMC </center> </font> </b> </p>      <p>     <center> CARLOS JAVIER BARRERA<sup>1</sup>,  JUAN CARLOS CORREA<sup>2</sup> </center> </p>      <p> <sup>1</sup>Instituto Tecnol&oacute;gico Metropolitano Instituci&oacute;n Universitaria (ITM), Facultad de Ciencias B&aacute;sicas, Medell&iacute;n, Colombia. Docente tiempo completo especial. Email: <a href="mailto:cjbarrer@unal.edu.co">cjbarrer@unal.edu.co</a>     <br>  <sup>2</sup>Universidad Nacional de Colombia, Facultad de Ciencias, Escuela de Estad&iacute;stica, Medell&iacute;n, Colombia. Profesor asociado. Email: <a href="mailto:jccorrea@unalmed.edu.co">jccorrea@unalmed.edu.co</a>     <br> </p>  <hr size="1">      ]]></body>
<body><![CDATA[<p> <b>     <center> Resumen </center> </b> </p>      <p> En el estudio de la confiabilidad es muy frecuente el desconocimiento de par&aacute;metros poblacionales; por tanto, es necesario recoger informaci&oacute;n muestral relevante para la estimaci&oacute;n de estos a trav&eacute;s de distribuciones de probabilidad, conocidas como distribuci&oacute;n a priori. Los m&eacute;todos bayesianos permiten incorporar opiniones subjetivas acerca de incertidumbres con respecto al par&aacute;metro o vector de par&aacute;metros de inter&eacute;s. La incertidumbre acerca del verdadero valor de un par&aacute;metro de inter&eacute;s &theta; en la poblaci&oacute;n es modelada por la funci&oacute;n de densidad a priori &pi;(&theta;), (&theta; \in &Theta;). Para obtener las distribuciones predictivas bayesianas, se implementar&aacute; la metodolog&iacute;a MCMC, la cual exige calibraci&oacute;n, dise&ntilde;o, implementaci&oacute;n y validaci&oacute;n de algoritmos apropiados. </p>      <p> <b> Palabras clave: </b> a priori, distribuci&oacute;n predictiva, fiabilidad, MCMC. </p>  <hr size="1">      <p> <b>     <center> Abstract </center> </b> </p>      <p> In reliability studies it is common to not know the population parameters, therefore, it becomes necessary to collect a sample in order to estimate the parameters of the assumed probability distribution. Bayesian methods allow to incorporate subjective information about uncertainties regarding the parameter or parameters of interest. From the bayesian point of view, the uncertainty about the true value of a parameter of interest &theta; in the population, is modeled by the prior density function &pi;(&theta;), (&theta;\in&Theta;). We will implement the methodology MCMC to obtain the predictive bayesian distributions, which requires the calibration, design, implementation, in addition to the validation of appropriate algorithms. </p>      <p> <b> Key words: </b> Prior, Predictive Distribution, Reliability, MCMC. </p>  <hr size="1">      <p> Texto completo disponible en <a href="pdf/rce/v31n2/v31n2a01.pdf">PDF</a> </p>  <hr size="1">      <p> <b> <font size="3"> Referencias </font> </b> </p>       ]]></body>
<body><![CDATA[<!-- ref --><p> 1. Casella, G. & George, (1992), `Explaining the Gibbs Sampler´, <i>The American Statistician</i> <b>46</b>(3), 167-174. &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=S0120-1751200800020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 2. Christensen, R. & Huffman, M. (1985), `Bayesian Point Estimation Using the Predictive Distribution´, <i>The American Statistician</i> <b>39</b>(4), 319-321. &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=S0120-1751200800020000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 3. Dunsmore, I. (1974), `The Bayesian Predictive Distribution in Life Testing Models´, <i>Technometrics</i> <b>16</b>(3), 455-460. &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=S0120-1751200800020000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 4. Hewett, J. (1968), `A Note on Prediction Intervals Based on Tartial Observations in Certain Life Test Experiments´, <i>Technometrics</i> <b>10</b>, 850-853. &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=S0120-1751200800020000100004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 5. Hill, G. (2002), <i>Bayesian Methods</i>, Chapman and Hall. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000027&pid=S0120-1751200800020000100005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 6. Kalbfleisch, J. D. (1971), Likelihood Methods of Prediction, `Foundations of Statistical Inference´, p. 378-392. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000028&pid=S0120-1751200800020000100006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 7. Kao, E. (1997), <i>An Introduction to Stochastic Processes</i>, Duxbury Press. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000029&pid=S0120-1751200800020000100007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 8. Komaki, F. (2001), `A Shrinkage Predictive Distribution for Multivariate Normal Observables´, <i>Biometrika</i> <b>88</b>(3), 859-864. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000030&pid=S0120-1751200800020000100008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 9. Kwiatkowski, D., Phillips, P. & Schmidt, P. (1992), `Testing the Null Hypothesis of Stationarity Against the Alternative of a Unit Root´, <i>Journal of Econometrics</i> <b>54</b>, 159-178. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000031&pid=S0120-1751200800020000100009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 10. R Development Core Team, (2007), <i>R: A Language and Environment for Statistical Computing</i>, R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0. *<a href="http://www.R-project.org" target="_blank">http://www.R-project.org</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000032&pid=S0120-1751200800020000100010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><center> <b>&#91;Recibido en febrero de 2008. Aceptado en septiembre de 2008&#93;</b> </center> <hr size="1">      <p> Este art&iacute;culo se puede citar en <i>LaTeX</i> utilizando la siguiente referencia bibliogr&aacute;fica de <i>BibTeX</i>: </p> <code><font size="2">@ARTICLE{RCEv31n2a01,    <br>  &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Barrera, Carlos Javier and Correa, Juan Carlos},    <br>  &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Distribuci&oacute;n predictiva bayesiana para modelos de pruebas de vida v&iacute;a MCMC}},    <br>  &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Estad&iacute;stica},    <br> &nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2008},    <br> &nbsp;&nbsp;&nbsp; volume &nbsp;= {31},    <br> &nbsp;&nbsp;&nbsp; number &nbsp;= {2},    <br> &nbsp;&nbsp;&nbsp; pages &nbsp; = {145-155}    <br> }</font></code>  <hr size="1"> </font>     ]]></body>
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</article>
