<?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>0186-7210</journal-id>
<journal-title><![CDATA[Estudios demográficos y urbanos]]></journal-title>
<abbrev-journal-title><![CDATA[Estud. demogr. urbanos]]></abbrev-journal-title>
<issn>0186-7210</issn>
<publisher>
<publisher-name><![CDATA[El Colegio de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0186-72102007000300523</article-id>
<article-id pub-id-type="doi">10.24201/edu.v22i3.1271</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Medición de la baja fecundidad: repensando los métodos demográficos]]></article-title>
<article-title xml:lang="en"><![CDATA[Measuring Low Fertility: Rethinking Demographic Methods]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kohler]]></surname>
<given-names><![CDATA[Hans-Peter]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Salamanca  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Pennsylvania  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<volume>22</volume>
<numero>3</numero>
<fpage>523</fpage>
<lpage>581</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0186-72102007000300523&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0186-72102007000300523&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0186-72102007000300523&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el análisis de la fecundidad baja cobra importancia una serie de conceptos básicos como la progresión de paridad a partir de tablas de vida -aquí llamadas tablas de fecundidad-, y la consideración de los efectos de los cambios de calendario sobre las tasas de fecundidad observadas. En este artículo se presenta la génesis histórica de estos conceptos y su relación con otros similares -como la traslación demográfica-, acompañados de ejemplos de aplicación en el análisis de la fecundidad de periodo y de cohorte. Algunas investigaciones recientes, entre las que se incluyen las de los autores, permiten hoy en día obtener intensidades de fecundidad ajustadas por calendario, a partir de las cuales se pueden conseguir todo tipo de medidas de fecundidad de periodo libres de efectos calendario o proyectar la fecundidad a partir del método de progresión de paridad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In a low fertility context there are a number of basic concepts that become more relevant for the analysis of fertility, such as parity progression analysis through life-table methods, here called fertility tables, and the consideration of the effects of tempo change on observed fertility rates. In this articles, these ideas are presented together with their historical genesis and their relationship to similar concepts such as demographic translation, together with examples of application to both period and cohort fertility analysis. Recent research, including research done by the authors, allow us today to estimate tempo-adjusted fertility intensities that can be used to obtain any tempo-adjusted period fertility measure or parity-progression fertility projections.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[efecto calendario]]></kwd>
<kwd lng="es"><![CDATA[intensidades]]></kwd>
<kwd lng="es"><![CDATA[tasas de incidencia]]></kwd>
<kwd lng="es"><![CDATA[tabla de fecundidad]]></kwd>
<kwd lng="es"><![CDATA[tasa global de fecundidad ajustada]]></kwd>
<kwd lng="es"><![CDATA[progresión de paridad]]></kwd>
<kwd lng="es"><![CDATA[efecto de distribución por paridad]]></kwd>
<kwd lng="es"><![CDATA[traslación demográfica]]></kwd>
<kwd lng="en"><![CDATA[tempo effect]]></kwd>
<kwd lng="en"><![CDATA[intensities]]></kwd>
<kwd lng="en"><![CDATA[incidence rates]]></kwd>
<kwd lng="en"><![CDATA[fertility table]]></kwd>
<kwd lng="en"><![CDATA[adjusted total fertility rate]]></kwd>
<kwd lng="en"><![CDATA[parity progression]]></kwd>
<kwd lng="en"><![CDATA[parity composition effect]]></kwd>
<kwd lng="en"><![CDATA[demographic translation]]></kwd>
</kwd-group>
</article-meta>
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