<?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>2007-4018</journal-id>
<journal-title><![CDATA[Revista Chapingo serie ciencias forestales y del ambiente]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo ser. cienc. for. ambient]]></abbrev-journal-title>
<issn>2007-4018</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo, Coordinación de Revistas Institucionales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-40182007000100029</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[AJUSTE ÓPTIMO DE LA DISTRIBUCIÓN LOGNORMAL DE TRES PARÁMETROS EN HÍBRIDOS DE POPULUS]]></article-title>
<article-title xml:lang="en"><![CDATA[OPTIMAL ADJUSTMENT OF THE TRHEE-PARAMETERS LOGNORMAL DISTRIBUTION IN HIBRID OF POPULUS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vallejos-Barra]]></surname>
<given-names><![CDATA[O. S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Talca Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<volume>13</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>32</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182007000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182007000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182007000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La variable diámetro a la altura del pecho, medido a 1.3 m desde el suelo (DAP) es lognormal si log(DAP-&#952;) se distribuye normalmente. Para simplificar el ajuste de esta función de densidad de probabilidad (fdp) se supone que el parámetro de localización (&#952;) es cero en híbridos de Populus; sin embargo, en algunos casos esta simplificación no asegura el mejor ajuste de la fdp, incidiendo en la representación de la estructura horizontal de los híbridos. El objetivo de la investigación fue calcular el parámetro &#952; que proporcione el mejor ajuste de la fdp lognormal del DAP en los híbridos I-488 e I-63/51. Para este cálculo se utilizó un algoritmo de búsqueda binaria, que minimizó el estadístico Dn de la prueba de Kolmogorov-Smirnov. 38 % de las parcelas presentó un parámetro &#952; distinto de cero, originando una mejoría del valor de probabilidad (P) entre 0.02 y 55.4 %. Se hizo un análisis de varianza no paramétrico de la variable &#8220;&#8730;n * Dn&#8221;, ya que la variable original y múltiples transformaciones no permitieron aceptar los supuestos del análisis paramétrico. El tipo de ajuste presentó diferencias estadísticas altamente significativas con un valor de 17.1 (P&lt;0.001) de la prueba de Kruskal-Wallis. Para los híbridos y edades consideradas no hubo diferencias estadísticas, los híbridos presentaron un valor de 0.1 (P&gt;0.800) y las edades un valor de 11.2 (P&gt;0.260).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY The DBH variable will be lognormal if log(DBH-&#952;) it is Normal distributed. To simplify the adjustment of this probability density function (fdp), the localization parameter (&#952;) is assumed zero in hybrid of Populus; however, in some cases this simplification doesn&#8217;t guarantee the best adjustment, affected the representation of the horizontal structure. In this research, the parameter that provides the best adjustment in the fdp lognormal of the DBH in the hybrid I-488 and I-63/51 was calculated. The algorithm of binary search was used which minimizes the statistical Dn of the Kolmogorov-Smirnov test. 38 % of the presented a parameter different from zero, originating a P-Value improvement between 0.02 and 55.4 %. A non parametric variance analysis of the variable &#8220;&#8730;n * Dn&#8221; was made, since this variable and multiple transformations did not allow to accept parametric analysis assumptions. The adjustment type presented highly significant statistical differences with a value of 17.1 (P-Value&lt;0.001) of the Kruskal-Wallis test. Both hybrids and ages considered did not have statistical differences, hybrids presented a value of 0.1 (P-Value &gt;0.800) and ages a value of 11.2 (PValue &gt;0.260).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[parámetro de localización]]></kwd>
<kwd lng="es"><![CDATA[optimización y Kolmogorov-Smirnov]]></kwd>
<kwd lng="en"><![CDATA[localization parameter]]></kwd>
<kwd lng="en"><![CDATA[optimization and Kolmogorov-Smirnov]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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