<?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>S0120-17512010000200008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Size Problem of Bootstrap Tests when the Null isNon- or Semiparametric]]></article-title>
<article-title xml:lang="es"><![CDATA[El problema del tamaño de los contrastes bootstrap cuando la hipótesis nula es No- o semiparamétrica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BARRIENTOS-MARÍN]]></surname>
<given-names><![CDATA[JORGE]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SPERLICH]]></surname>
<given-names><![CDATA[STEFAN]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Económicas Departamento de Economía]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Georg August Universität Göttingen Institut für Statistik und Ökonometrie ]]></institution>
<addr-line><![CDATA[Göttingen ]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>15</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>15</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>307</fpage>
<lpage>319</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-17512010000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-17512010000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-17512010000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In non- and semiparametric testing, the wild bootstrap is a standard method for determining the critical values of tests. If the null hypothesis is also semi- or nonparametric, then we know that at least asymptotically oversmoothing is necessary in the pre-estimation of the null model for generating the bootstrap samples. See Hardle & Marron (1990, 1991). However, in practice this knowledge is of little help. In this note we highlight that this bandwidth choice problem can become quite serious. As an alternative, we briegly discuss the possibility of subsampling.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En contrastes no- y semiparamétricos el wild-bootstrap es un método estándar para la determinación de los valores críticos de los estadísticos de contrastes. Si la hipótesis nula es no o semiparamétrica, sabemos que al menos asintóticamente es necesaria una sobre-suavización en la pre-estimación del modelo bajo la nula para generar las muestras bootstrap, ver por ejemplo Hardle & Marron (1990, 1991). No obstante, en la práctica este conocimiento es de poca o ninguna ayuda. En este artículo, ponemos de manifiesto que el problema de la selección de la banda de suavidad para procedimientos de contraste puede ser muy serio. Como alternativa, discutimos brevemente la posibilidad de usar sub-muestras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Bandwidth choice]]></kwd>
<kwd lng="en"><![CDATA[Bootstrap tests]]></kwd>
<kwd lng="en"><![CDATA[Nonparametric specification tests]]></kwd>
<kwd lng="es"><![CDATA[ancho de banda]]></kwd>
<kwd lng="es"><![CDATA[contrastes de especificación no-paramétricos]]></kwd>
<kwd lng="es"><![CDATA[contrastes bootstrap]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">      <p> <b> <font size="4">     <center> The Size Problem of Bootstrap Tests when the Null isNon- or Semiparametric </center> </font> </b> </p>      <p> <b> <font size="3">     <center> El problema del tama&ntilde;o de los contrastes bootstrap cuando la hip&oacute;tesis nula es No- o semiparam&eacute;trica </center> </font> </b> </p>      <p>     <center> JORGE BARRIENTOS-MAR&Iacute;N<sup>1</sup>,  STEFAN SPERLICH<sup>2</sup> </center> </p>      <p> <sup>1</sup>Universidad de Antioquia, Facultad de Ciencias Econ&oacute;micas, Departamento de Econom&iacute;a, Medell&iacute;n, Colombia. Profesor. Email: <a href="mailto:jbarr@economicas.udea.edu.co">jbarr@economicas.udea.edu.co</a>     <br>  <sup>2</sup>Georg August Universit&auml;t G&ouml;ttingen, Institut f&uuml;r Statistik und &Ouml;konometrie, G&ouml;ttingen, Germany. Professor. Email: <a href="mailto:stefan.sperlich@wiwi.uni-goettingen.de">stefan.sperlich@wiwi.uni-goettingen.de</a>     <br> </p>  <hr size="1">      ]]></body>
<body><![CDATA[<p> <b>     <center> Abstract </center> </b> </p>      <p> In non- and semiparametric testing, the wild bootstrap is a standard method for determining the critical values of tests. If the null hypothesis is also semi- or nonparametric, then we know that at least asymptotically oversmoothing is necessary in the pre-estimation of the null model for generating the bootstrap samples. See Hardle &amp; Marron (1990, 1991). However, in practice this knowledge is of little help. In this note we highlight that this bandwidth choice problem can become quite serious. As an alternative, we briegly discuss the possibility of subsampling. </p>      <p> <b> Key words: </b> Bandwidth choice, Bootstrap tests, Nonparametric specification tests. </p>  <hr size="1">      <p> <b>     <center> Resumen </center> </b> </p>  </font>     <p><font size="2" face="verdana"> En contrastes no- y semiparam&eacute;tricos el <i>wild-bootstrap</i> es un m&eacute;todo est&aacute;ndar para la determinaci&oacute;n de los valores cr&iacute;ticos de los estad&iacute;sticos de contrastes. Si la hip&oacute;tesis nula es no o semiparam&eacute;trica, sabemos que al menos asint&oacute;ticamente es necesaria una sobre-suavizaci&oacute;n en la pre-estimaci&oacute;n del modelo bajo la nula para generar las muestras bootstrap, ver por ejemplo Hardle &amp; Marron (1990, 1991).     <br>  No obstante, en la pr&aacute;ctica este conocimiento es de poca o ninguna ayuda. En este art&iacute;culo, ponemos de manifiesto que el problema de la selecci&oacute;n de la banda de suavidad para procedimientos de contraste puede ser muy serio. Como alternativa, discutimos brevemente la posibilidad de usar sub-muestras. </font></p>  <font size="2" face="verdana">    <p> <b> Palabras clave: </b> ancho de banda, contrastes de especificaci&oacute;n no-param&eacute;tricos, contrastes bootstrap. </p>  <hr size="1">      <p> Texto completo disponible en <a href="pdf/rce/v33n2/v33n2a08.pdf">PDF</a> </p>  <hr size="1">      ]]></body>
<body><![CDATA[<p> <b> <font size="3"> References </font> </b> </p>       <!-- ref --><p> 1. Barrientos, J. (2007), Some Practical Problems of Recent Nonparametric Procedures: Testing, Estimation and Application, Tesis Doctoral, Departamento de Fundamentos del An&aacute;lisis Econ&oacute;mico, Universidad de Alicante, Espa&ntilde;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=000024&pid=S0120-1751201000020000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 2. Delgado, M. A., Rodr&iacute;guez, J. M. &amp; Wolf, M. 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(2007), 'Testing the Link when the Index is Semiparametric - A Comparison Study', <i>Computational Statistics and Data Analysis</i> <b>12</b>, 6565-6581. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000033&pid=S0120-1751201000020000800010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 11. Spokoiny, V. (1996), 'Adaptive Hypothesis Testing using Wavelets', <i>Annals of Statistics</i> <b>24</b>, 2477-2498. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000034&pid=S0120-1751201000020000800011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 12. Spokoiny, V. (1998), 'Adaptive and spatially adaptive testing of a nonparametric hypothesis', <i>Mathematical Methods of Statistics</i> <b>7</b>(245-273). &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000035&pid=S0120-1751201000020000800012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><center> <b>&#91;Recibido en marzo de 2010. Aceptado en octubre de 2010&#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{RCEv33n2a08,    <br>  &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Barrientos-Mar&iacute;n, Jorge and Sperlich, Stefan},    <br>  &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{The Size Problem of Bootstrap Tests when the Null isNon- or Semiparametric}},    <br>  &nbsp;&nbsp;&nbsp; JOURNAL = {Revista Colombiana de Estad&iacute;stica},    <br> &nbsp;&nbsp;&nbsp; YEAR &nbsp;&nbsp; = {2010},    <br> &nbsp;&nbsp;&nbsp; volume &nbsp;= {33},    ]]></body>
<body><![CDATA[<br> &nbsp;&nbsp;&nbsp; number &nbsp;= {2},    <br> &nbsp;&nbsp;&nbsp; pages &nbsp; = {307-319}    <br> }</font></code>  <hr size="1"> </font>      ]]></body><back>
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