<?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>S0120-17512009000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Reducción de modelos en la presencia de parámetros de perturbación]]></article-title>
<article-title xml:lang="en"><![CDATA[Reduction of Models in the Presence of Nuisance Parameters]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FARIAS]]></surname>
<given-names><![CDATA[RAFAEL]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MORENO]]></surname>
<given-names><![CDATA[GERMÁN]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PATRIOTA]]></surname>
<given-names><![CDATA[ALEXANDRE]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de São Paulo Instituto de Matemática y Estadística Departamento de Estadística]]></institution>
<addr-line><![CDATA[São Paulo ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de São Paulo Instituto de Matemática y Estadística Departamento de Estadística]]></institution>
<addr-line><![CDATA[São Paulo ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de São Paulo Instituto de Matemática y Estadística Departamento de Estadística]]></institution>
<addr-line><![CDATA[São Paulo ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>06</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>06</month>
<year>2009</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>99</fpage>
<lpage>121</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-17512009000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-17512009000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-17512009000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En muchos problemas de inferencia estadística existe interés en estimar solamente algunos elementos del vector de parámetros que definen el modelo adoptado. Generalmente, esos elementos están asociados a las medidas de localización, y los parámetros adicionales -que en la mayoría de las veces están en el modelo solo para controlar la dispersión o la asimetría- son conocidos como parámetros de perturbación o de incomodidad ({\it nuisance parameters}) de las distribuciones subyacentes. Es común estimar todos los parámetros del modelo y hacer inferencias exclusivamente para los parámetros de interés. Dependiendo del modelo adoptado, este procedimiento puede ser muy costoso, tanto algebraica como computacionalmente, por lo cual conviene reducirlo para que dependa únicamente de los parámetros de interés. En este artículo, hacemos una revisión de los métodos de estimación en la presencia de parámetros de perturbación y consideramos algunas aplicaciones en modelos recientemente discutidos en la literatura.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In many statistical inference problems, there is interest in estimation of only some elements of the parameter vector that defines the adopted model. In general, such elements are associated to measures of location and the additional terms, known as nuisance parameters, to control the dispersion and asymmetry of the underlying distributions. To estimate all the parameters of the model and to draw inferences only on the parameters of interest. Depending on the adopted model, this procedure can be both algebraically is common and computationally very costly and thus it is convenient to reduce it, so that it depends only on the parameters of interest. This article reviews estimation methods in the presence of nuisance parameters and consider some applications in models recently discussed in the literature.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estimación]]></kwd>
<kwd lng="es"><![CDATA[parámetro de perturbación]]></kwd>
<kwd lng="es"><![CDATA[función deverosimilitud]]></kwd>
<kwd lng="es"><![CDATA[suficiencia]]></kwd>
<kwd lng="es"><![CDATA[información auxiliar]]></kwd>
<kwd lng="en"><![CDATA[Estimation]]></kwd>
<kwd lng="en"><![CDATA[Nuisance parameter]]></kwd>
<kwd lng="en"><![CDATA[Likelihood function]]></kwd>
<kwd lng="en"><![CDATA[Sufficiency]]></kwd>
<kwd lng="en"><![CDATA[Ancillarity]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 
<font size="2" face="verdana">

    <p>
<b>
<font size="4">
    <center>
Reducci&oacute;n de modelos en la presencia de par&aacute;metros de perturbaci&oacute;n
</center>
</font>
</b>
</p>

    <p>
<b>
<font size="3">
    <center>
Reduction of Models in the Presence of Nuisance Parameters
</center>
</font>
</b>
</p>

    <p>
    <center>
RAFAEL FARIAS<sup>1</sup>, 
GERM&Aacute;N MORENO<sup>2</sup>, 
ALEXANDRE PATRIOTA<sup>3</sup>
</center>
</p>

    <p>
<sup>1</sup>Universidad de São Paulo, Instituto de Matem&aacute;tica y Estad&iacute;stica, Departamento de Estad&iacute;stica, São Paulo, Brasil. Estudiante de doctorado. Email: <a href="mailto:rfarias@ime.usp.br">rfarias@ime.usp.br</a>
    <br>

<sup>2</sup>Universidad de São Paulo, Instituto de Matem&aacute;tica y Estad&iacute;stica, Departamento de Estad&iacute;stica, São Paulo, Brasil. Universidad Industrial de Santander (UIS), Escuela de Matem&aacute;ticas, Bucaramanga, Colombia. Profesor asistente. Email: <a href="mailto:gmorenoa@uis.edu.co">gmorenoa@uis.edu.co</a>
    <br>

<sup>3</sup>Universidad de São Paulo, Instituto de Matem&aacute;tica y Estad&iacute;stica, Departamento de Estad&iacute;stica, São Paulo, Brasil. Estudiante de doctorado. Email: <a href="mailto:patriota@ime.usp.br">patriota@ime.usp.br</a>
    ]]></body>
<body><![CDATA[<br>
</p>

<hr size="1">

    <p>
<b>
    <center>
Resumen
</center>
</b>
</p>

    <p>
En muchos problemas de inferencia estad&iacute;stica existe inter&eacute;s en estimar solamente algunos elementos del vector de par&aacute;metros que definen el modelo adoptado. Generalmente, esos elementos est&aacute;n asociados a las medidas de localizaci&oacute;n, y los par&aacute;metros adicionales -que en la mayor&iacute;a de las veces est&aacute;n en el modelo solo para controlar la dispersi&oacute;n o la asimetr&iacute;a- son conocidos como par&aacute;metros de perturbaci&oacute;n o de incomodidad ({\it nuisance parameters}) de las distribuciones subyacentes. Es com&uacute;n estimar todos los par&aacute;metros del modelo y hacer inferencias exclusivamente para los par&aacute;metros de inter&eacute;s. Dependiendo del modelo adoptado, este procedimiento puede ser muy costoso, tanto algebraica como computacionalmente, por lo cual conviene reducirlo para que dependa &uacute;nicamente de los par&aacute;metros de inter&eacute;s. En este art&iacute;culo, hacemos una revisi&oacute;n de los m&eacute;todos de estimaci&oacute;n en la presencia de par&aacute;metros de perturbaci&oacute;n y consideramos algunas aplicaciones en modelos recientemente discutidos en la literatura.
</p>

    <p>
<b>
Palabras clave:
</b>
estimaci&oacute;n,
par&aacute;metro de perturbaci&oacute;n,
funci&oacute;n deverosimilitud,
suficiencia,
informaci&oacute;n auxiliar.
</p>

<hr size="1">

    <p>
<b>
    <center>
Abstract
</center>
</b>
</p>

    <p>
In many statistical inference problems, there is interest in estimation of only some elements of the parameter vector that defines the adopted model. In general, such elements are associated to measures of location and the additional terms, known as nuisance parameters, to control the dispersion and asymmetry of the underlying distributions. To estimate all the parameters of the model and to draw inferences only on the parameters of interest. Depending on the adopted model, this procedure can be both algebraically is common and computationally very costly and thus it is convenient to reduce it, so that it depends only on the parameters of interest. This article reviews estimation methods in the presence of nuisance parameters and consider some applications in models recently discussed in the literature.
</p>

    <p>
<b>
Key words:
</b>
Estimation,
Nuisance parameter,
Likelihood function,
Sufficiency,
Ancillarity.
</p>

<hr size="1">

    <p>
Texto completo disponible en <a href="pdf/rce/v32n1/v32n1a06.pdf">PDF</a>
</p>

<hr size="1">

    ]]></body>
<body><![CDATA[<p>
<b>
<font size="3">
Referencias
</font>
</b>
</p>


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<b>&#91;Recibido en junio de 2008. Aceptado en marzo de 2009&#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{RCEv32n1a06,    <br>
 &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Farias, Rafael and Moreno, Germ&aacute;n and Patriota, Alexandre},    <br>
 &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Reducci&oacute;n de modelos en la presencia de par&aacute;metros de perturbaci&oacute;n}},    <br>
 &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Estad&iacute;stica},    <br>
&nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2009},    <br>
&nbsp;&nbsp;&nbsp; volume &nbsp;= {32},    <br>
&nbsp;&nbsp;&nbsp; number &nbsp;= {1},    <br>
&nbsp;&nbsp;&nbsp; pages &nbsp; = {99-121}    <br>
}</font></code>

<hr size="1">
</font>
    ]]></body>
<body><![CDATA[ ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Azzalini]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`A Class of Distributions which Includes the Normal Ones´]]></article-title>
<source><![CDATA[Scandinavian Journal of Statistics]]></source>
<year>1985</year>
<volume>12</volume>
<page-range>171-178</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barndorff-Nielsen]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`On a Formula for the Distribution of the Maximum Likelihood Estimator´]]></article-title>
<source><![CDATA[Biometrika]]></source>
<year>1983</year>
<volume>70</volume>
<page-range>343-365</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barndorff-Nielsen]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Likelihood Theory]]></source>
<year>1991</year>
<publisher-loc><![CDATA[London ]]></publisher-loc>
<publisher-name><![CDATA[Chapman and Hall]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cordeiro]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Introdução à Teoria de Verossimilhança]]></article-title>
<source><![CDATA[`10 Simpósio Nacional de Probabilidade e Estatística´]]></source>
<year>1992</year>
<publisher-loc><![CDATA[Rio de Janeiro ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cox]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Reid]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[`Parameter Orthogonality and Approximate Conditional Inference (with Discussion)´]]></article-title>
<source><![CDATA[Journal The Royal Statistical Society: Series B]]></source>
<year>1987</year>
<volume>49</volume>
<page-range>1-39</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cox]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
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