<?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>1645-9911</journal-id>
<journal-title><![CDATA[Tékhne - Revista de Estudos Politécnicos]]></journal-title>
<abbrev-journal-title><![CDATA[Tékhne]]></abbrev-journal-title>
<issn>1645-9911</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico do  Cávado e do Ave]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1645-99112005000200005</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Hipótese das expectativas e alteração na estrutura temporal das taxas de juro]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado]]></surname>
<given-names><![CDATA[Isabel Alexandra Neves]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinho]]></surname>
<given-names><![CDATA[Joaquim Carlos da Costa]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Portucalense  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade de Aveiro  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<numero>4</numero>
<fpage>59</fpage>
<lpage>85</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1645-99112005000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1645-99112005000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1645-99112005000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Neste trabalho analisamos a Hipótese das Expectativas da Estrutura Temporal das Taxas de Juro (ETTJ) utilizando uma base de dados semanais obtida a partir do rendimento de títulos da dívida pública portuguesa. Foi estudada a relação existente entre taxas de juro spot e a estrutura temporal das taxas de juro com base em testes derivados da hipótese de expectativas racionais. Os resultados obtidos sugerem que a ETTJ contêm determinada informação sobre a direcção dos movimentos futuros das taxas de juro spot tanto a curto como a longo prazo, contudo nos testes efectuados rejeita-se a hipótese das expectativas racionais para o período em análise. As estimações efectuadas, com o modelo GARCH, indiciam que este resultado está relacionado com a existência de variações nos prémios de risco associados às taxas de juro.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we examine the Expectations Hypothesis of the term structure of interest rates using a weekly data base constructed with data from the Portuguese Government public debt. We study the relation between spot rates and the term structure of interest rates based on Rational Expectations Hypothesis tests. The results indicate that the term structure contains information about the future movements of spot rates, but the tests reject the Expectation Hypothesis. Besides, the GARCH estimations suggest that this result is connected whit the existence of variations in the risk premium of interest rates.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[hipótese das expectativas]]></kwd>
<kwd lng="pt"><![CDATA[taxa de juro]]></kwd>
<kwd lng="pt"><![CDATA[estrutura temporal das taxas de juro]]></kwd>
<kwd lng="en"><![CDATA[e expectations hypothesis]]></kwd>
<kwd lng="en"><![CDATA[interest rate]]></kwd>
<kwd lng="en"><![CDATA[term structure of interest rates]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><b>Hip&oacute;tese das expectativas e altera&ccedil;&atilde;o    na estrutura temporal das taxas de juro</b></p>      <p>&nbsp;</p>      <p align="center">Isabel Alexandra Neves Maldonado<a href="#1">*</a><a name="top1"></a></p>      <p align="center">Joaquim Carlos da Costa Pinho<a href="#2">**</a><a name="top2"></a></p>      <p>&nbsp;</p>      <p align="center"><a href="mailto:ianm@upt.pt">ianm@upt.pt</a></p>      <p align="center"><a href="mailto:cpinho@egi.ua.pt">cpinho@egi.ua.pt</a></p>      <p>&nbsp;</p>      <p align="justify"><b>Resumo.</b> Neste trabalho analisamos a Hip&oacute;tese    das Expectativas da Estrutura Temporal das Taxas de Juro (ETTJ) utilizando uma    base de dados semanais obtida a partir do rendimento de t&iacute;tulos da d&iacute;vida    p&uacute;blica portuguesa. Foi estudada a rela&ccedil;&atilde;o existente entre    taxas de juro <i>spot</i> e a estrutura temporal das taxas de juro com base em testes    derivados da hip&oacute;tese de expectativas racionais. Os resultados obtidos    sugerem que a ETTJ cont&ecirc;m determinada informa&ccedil;&atilde;o sobre a    direc&ccedil;&atilde;o dos movimentos futuros das taxas de juro <i>spot</i> tanto a    curto como a longo prazo, contudo nos testes efectuados rejeita-se a hip&oacute;tese    das expectativas racionais para o per&iacute;odo em an&aacute;lise. As estima&ccedil;&otilde;es    efectuadas, com o modelo GARCH, indiciam que este resultado est&aacute; relacionado    com a exist&ecirc;ncia de varia&ccedil;&otilde;es nos pr&eacute;mios de risco    associados &agrave;s taxas de juro.</p>      <p>Palavras-chave: hip&oacute;tese das expectativas, taxa de juro,  estrutura temporal das taxas de juro</p>      ]]></body>
<body><![CDATA[<p>&nbsp;</p>      <p align="justify"><b>Abstract.</b> In this paper we examine the Expectations    Hypothesis of the term structure of interest rates using a weekly data base    constructed with data from the Portuguese Government public debt. We study the    relation between spot rates and the term structure of interest rates based on    Rational Expectations Hypothesis tests. The results indicate that the term structure    contains information about the future movements of spot rates, but the tests    reject the Expectation Hypothesis. Besides, the GARCH estimations suggest that    this result is connected whit the existence of variations in the risk premium    of interest rates.</p>      <p>Keywords: e expectations hypothesis, interest rate, term structure  of interest rates</p>      <p>&nbsp;</p>     <p>&nbsp;</p>      <p>Texto completo disponível apenas em PDF.</p>     <p>Full text only available in PDF format.</p>      <p>&nbsp;</p>     <p>&nbsp;</p>      <p align="center"><b>Refer&ecirc;ncias bibliogr&aacute;ficas</b></p>      ]]></body>
<body><![CDATA[<!-- ref --><p>Abad, P. 2003a. Inestabilidad en la relaci&oacute;n entre los tipos  forward y los tipos de contado futuros en la estructura temporal del  mercado de swaps de tipos de inter&eacute;s, <i>Moneda y Cr&eacute;dito</i>,  Vol. 217: 101-138.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000023&pid=S1645-9911200500020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>Abad, P. 2003b. Un contraste alternativo de la hip&oacute;tesis de  las expectativas en swaps de tipos de inter&eacute;s, <i>Revista de Econom&iacute;a  Financiera</i>.</p>      <p>Abad, P., &amp; Robles, M. D. 2003. Estructura temporal de los tipos  de inter&eacute;s: teor&iacute;a y evidencia emp&iacute;rica, <i>Revista  Asturiana de Economia</i>, Vol. RAE n.&ordm; 27: 7-47.</p>      <p>Ad&atilde;o, B., &amp; Lu&iacute;s, J. B. 1997. Teste da Teoria das  Expectativas para a Curva de Rendimentos de Portugal, <i>Boletim Econ&oacute;mico  do banco de Portugal</i>, Banco de Portugal ed.: 37-42.</p>      <p>Ayuso, J., Novales, A., &amp; De La Torre, M. L. 1991. Estructura  intertemporal y primas por plazo en el mercado interbancario, <i>Cuadernos  Aragoneses de Econom&iacute;a</i>, Vol. 1, n.&ordm; 1: 35-53.</p>      <p>Bekaert, G., &amp; Hodrick, R. J. 2001. Expectation hypotheses test,  <i>Journal of Finance</i>, Vol. 56, n.&ordm; 4: 1357-1394.</p>      <p>Boero, G., &amp; Torricelli, C. 1995. <i>A comparative evaluation of  alternative models of the term structure of interest rates</i>. Paper  presented at the 5th AFIR International Colloquium.</p>      <p>Boero, G., &amp; Torricelli, C. 1999. The information in the term  structure of interest rates: further results for Germany, <i>Contributi di  Ricerca CRENoS</i>, CRENoS ed., Vol. 12: 38 p.</p>      <p>Campbell, J. Y., &amp; Shiller, R. J. 1987. Cointegration and tests  of present value models, <i>Journal of Political Economy</i>, Vol. 95, n.&ordm;  5: 1062-1088.</p>      <p>Campbell, J. Y., &amp; Shiller, R. J. 1991. Yield spreads and interest  rates movements: a bird's eye view, <i>Review of Economics Studies</i>, Vol. 58,  n.&ordm; 3: 495-514.</p>      ]]></body>
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<body><![CDATA[<p>&nbsp;</p>      <p><a href="#top1">*</a><a name="1"></a> UPT &#8211; Universidade Portucalense</p>     <p><a href="#top2">**</a><a name="2"></a> UA &#8211; Universidade de Aveiro</p>       ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Abad]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang="es"><![CDATA[Inestabilidad en la relación entre los tipos forward y los tipos de contado futuros en la estructura temporal del mercado de swaps de tipos de interés,]]></article-title>
<source><![CDATA[Moneda y Crédito]]></source>
<year>2003</year>
<volume>217</volume>
<page-range>101-138</page-range></nlm-citation>
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</back>
</article>
