<?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>S0120-17512010000200005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Propuesta de una prueba de rachas recortada para hipótesis de simetría]]></article-title>
<article-title xml:lang="en"><![CDATA[A Proposed Runs Trimming Test for the Hypothesis of Symmetry]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BABATIVA]]></surname>
<given-names><![CDATA[GIOVANY]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[CORZO]]></surname>
<given-names><![CDATA[JIMMY A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Departamento de Estadística]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Departamento de Estadística]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</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>251</fpage>
<lpage>271</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-17512010000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-17512010000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-17512010000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Combinando la teoría de rachas desarrollada por Corzo (1989) y la idea de Modarres & Gastwirth (1996), que utilizan el número de rachas que quedan después de recortar la sucesión dicotomizada, se proponen tres pruebas de rachas para la hipótesis de simetría. Utilizando la técnica de linealización de Taylor se aproxima el valor esperado y la varianza, y se realiza un estudio de aproximación de la distribución del estadístico por la distribución normal. Las pruebas propuestas son comparadas en términos de su potencia con algunas de las pruebas no paramétricas más recientes y comunes para dicho problema en tamaños de muestra n=10(1)25, n=30, n=50(50)250 y n=500. Para la comparación se utilizaron métodos de Monte Carlo, y las muestras fueron generadas de nueve distribuciones pertenecientes a la familia lambda generalizada (DLG). Las simulaciones indican que para una gran variedad de alternativas asimétricas las pruebas propuestas son más potentes que las pruebas existentes en la literatura.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Combining the runs theory developed by Corzo (1989) and the idea of Modarres & Gastwirth (1996), which uses the number of runs left after cutting the dichotomized succession, three families of statistics based on runs and three tests for the hypothesis of symmetry are proposed. Using the linearization Taylor's technique, the expected value and variance of two from the three proposed families is approximated. A study to aproximate the distribution of the statistics through the normal distribution for the studied sample sizes is realized. The proposed tests are compared in terms of their power with some other recent and common nonparametric tests for Symmetry, for the sample sizes n=10(1)25, n=30, n=50(50)250 and n=500. For this comparison, Monte Carlo methods were used and the samples were generated from nine distributions obtained from the generalized lambda distribution. The simulations indicate that, for a wide variety of asymmetric alternatives in the generalized lambda distribution, the tests proposed are more powerful than the existing tests in literature.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[distribución lambda generalizada]]></kwd>
<kwd lng="es"><![CDATA[potencia]]></kwd>
<kwd lng="es"><![CDATA[pruebas de rachas]]></kwd>
<kwd lng="es"><![CDATA[pruebas para simetría]]></kwd>
<kwd lng="en"><![CDATA[Lambda distribution]]></kwd>
<kwd lng="en"><![CDATA[Power]]></kwd>
<kwd lng="en"><![CDATA[Runs test]]></kwd>
<kwd lng="en"><![CDATA[Symmetry test]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">      <p> <b> <font size="4">     <center> Propuesta de una prueba de rachas recortada para hip&oacute;tesis de simetr&iacute;a </center> </font> </b> </p>      <p> <b> <font size="3">     <center> A Proposed Runs Trimming Test for the Hypothesis of Symmetry </center> </font> </b> </p>      <p>     <center> GIOVANY BABATIVA<sup>1</sup>,  JIMMY A. CORZO<sup>2</sup> </center> </p>      <p> <sup>1</sup>Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Estad&iacute;stica, Bogot&aacute;, Colombia. Egresado de maestr&iacute;a en estad&iacute;stica. Email: <a href="mailto:jgbabativam@unal.edu.co">jgbabativam@unal.edu.co</a>     <br>  <sup>2</sup>Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Estad&iacute;stica, Bogot&aacute;, Colombia. Profesor asociado. Email: <a href="mailto:jacorzos@unal.edu.co">jacorzos@unal.edu.co</a>     <br> </p>  <hr size="1">      ]]></body>
<body><![CDATA[<p> <b>     <center> Resumen </center> </b> </p>      <p> Combinando la teor&iacute;a de rachas desarrollada por Corzo (1989) y la idea de Modarres &amp; Gastwirth (1996), que utilizan el n&uacute;mero de rachas que quedan despu&eacute;s de recortar la sucesi&oacute;n dicotomizada, se proponen tres pruebas de rachas para la hip&oacute;tesis de simetr&iacute;a. Utilizando la t&eacute;cnica de linealizaci&oacute;n de Taylor se aproxima el valor esperado y la varianza, y se realiza un estudio de aproximaci&oacute;n de la distribuci&oacute;n del estad&iacute;stico por la distribuci&oacute;n normal. Las pruebas propuestas son comparadas en t&eacute;rminos de su potencia con algunas de las pruebas no param&eacute;tricas m&aacute;s recientes y comunes para dicho problema en tama&ntilde;os de muestra n=10(1)25, n=30, n=50(50)250 y n=500. Para la comparaci&oacute;n se utilizaron m&eacute;todos de Monte Carlo, y las muestras fueron generadas de nueve distribuciones pertenecientes a la familia lambda generalizada (DLG). Las simulaciones indican que para una gran variedad de alternativas asim&eacute;tricas las pruebas propuestas son m&aacute;s potentes que las pruebas existentes en la literatura. </p>      <p> <b> Palabras clave: </b> distribuci&oacute;n lambda generalizada, potencia, pruebas de rachas, pruebas para simetr&iacute;a. </p>  <hr size="1">      <p> <b>     <center> Abstract </center> </b> </p>      <p> Combining the runs theory developed by Corzo (1989) and the idea of Modarres &amp; Gastwirth (1996), which uses the number of runs left after cutting the dichotomized succession, three families of statistics based on runs and three tests for the hypothesis of symmetry are proposed. Using the linearization Taylor's technique, the expected value and variance of two from the three proposed families is approximated. A study to aproximate the distribution of the statistics through the normal distribution for the studied sample sizes is realized. The proposed tests are compared in terms of their power with some other recent and common nonparametric tests for Symmetry, for the sample sizes n=10(1)25, n=30, n=50(50)250 and n=500. For this comparison, Monte Carlo methods were used and the samples were generated from nine distributions obtained from the generalized lambda distribution. The simulations indicate that, for a wide variety of asymmetric alternatives in the generalized lambda distribution, the tests proposed are more powerful than the existing tests in literature. </p>      <p> <b> Key words: </b> Lambda distribution, Power, Runs test, Symmetry test. </p>  <hr size="1">      <p> Texto completo disponible en <a href="pdf/rce/v33n2/v33n2a05.pdf">PDF</a> </p>  <hr size="1">      <p> <b> <font size="3"> Referencias </font> </b> </p>       ]]></body>
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(1972), 'A Cram&eacute;r-Von Mises Type Statistic for Testing Symmetry', <i>The Annals of Mathematical Statistics</i> <b>43</b>, 2035-2038. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000041&pid=S0120-1751201000020000500019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 20. Tajuddin, I. (1994), 'Distribution-Free Test for Symmetry Based on the Wilcoxon Two-Sample Test', <i>Journal of Applied Statistics</i> <b>21</b>(5), 409-414. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000042&pid=S0120-1751201000020000500020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 21. Thas, O., Rayner, J. C. W. &amp; Best, D. J. (2005), 'Tests for Symmetry Based on the One-Sample Wilcoxon Signed Rank Statistic', <i>Communications in Statistics - Simulation and Computation</i> <b>34</b>, 957-973. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000043&pid=S0120-1751201000020000500021&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><center> <b>&#91;Recibido en marzo de 2009. 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{RCEv33n2a05,    <br>  &nbsp;&nbsp;&nbsp; AUTHOR &nbsp;= {Babativa, Giovany and Corzo, Jimmy A.},    <br>  &nbsp;&nbsp;&nbsp; TITLE &nbsp; = {{Propuesta de una prueba de rachas recortada para hip&oacute;tesis de simetr&iacute;a}},    <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},    <br> &nbsp;&nbsp;&nbsp; number &nbsp;= {2},    <br> &nbsp;&nbsp;&nbsp; pages &nbsp; = {251-271}    ]]></body>
<body><![CDATA[<br> }</font></code>  <hr size="1"> </font>      ]]></body><back>
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