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<div>
                  <span class="slideshow-title" style="font-size:14px;">Índices de Texto</span><br />
                  From: <a href="http://www.slideshare.net/ChaToX" class="slideshow-author">ChaToX</a>,
                  <span class="ago">8 months ago</span><br /><br />
                  <div class="slideshow-embed"><div style="width:425px;text-align:left" id="__ss_327181"><a style="font:14px Helvetica,Arial,Sans-serif;display:block;margin:12px 0 3px 0;text-decoration:underline;" href="http://www.slideshare.net/ChaToX/ndices-de-texto?type=powerpoint" title="Índices de Texto">Índices de Texto</a><object style="margin:0px" width="425" height="355"><param name="movie" value="http://static.slideshare.net/swf/ssplayer2.swf?doc=ndices-de-texto-1206833828888091-5&stripped_title=ndices-de-texto" /><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed src="http://static.slideshare.net/swf/ssplayer2.swf?doc=ndices-de-texto-1206833828888091-5&stripped_title=ndices-de-texto" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="font-size:11px;font-family:tahoma,arial;height:26px;padding-top:2px;">View SlideShare <a style="text-decoration:underline;" href="http://www.slideshare.net/ChaToX/ndices-de-texto?type=powerpoint" title="View Índices de Texto on SlideShare">presentation</a> or <a style="text-decoration:underline;" href="http://www.slideshare.net/upload?type=powerpoint">Upload</a> your own. (tags: <a style="text-decoration:underline;" href="http://slideshare.net/tag/information-retrieval">information-retrieval</a> <a style="text-decoration:underline;" href="http://slideshare.net/tag/2008">2008</a>)</div></div></div><br /><br />
                  <div class="slideshow-description">Presentación para un curso de sistemas de información</div><br /><br />
                  <a href="http://www.slideshare.net/ChaToX/ndices-de-texto" class="slideshow-link">SlideShare Link</a>
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Índices de Texto

From ChaToX, 8 months ago Add as contact

Presentación para un curso de sistemas de información

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Slide 1:Sistemas de Información II Tema 9. Bases de datos de texto Bibliografía: Baeza-Yates y Ribeiro-Neto: “Modern Information Retrieval”, 1999 Capítulo 7 Carlos Castillo UPF – 2008 1
Slide 2: Agenda Ley de Zipf De bytes a texto De texto a palabras De palabras a keywords Indexación 2
Slide 3: Importancia de las palabras Alta Sustantivos Grupos de sustantivos => Keywords Baja Artículos Preposiciones Variable Verbos 3
Slide 4: Frecuencia de las palabras Ley de Zipf f(wk) = frecuencia de la k-ésima palabra f(wk)  1/k 4
Slide 5: Ley de Zipf Frecuencia Pala

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