Permalink
Switch branches/tags
Nothing to show
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
69 lines (59 sloc) 2.46 KB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!--Converted with LaTeX2HTML 2008 (1.71)
original version by: Nikos Drakos, CBLU, University of Leeds
* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
* with significant contributions from:
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
<HTML>
<HEAD>
<TITLE>Position Tagging</TITLE>
<META NAME="description" CONTENT="Position Tagging">
<META NAME="keywords" CONTENT="egpaper_final">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
<META NAME="Generator" CONTENT="LaTeX2HTML v2008">
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
<LINK REL="STYLESHEET" HREF="egpaper_final.css">
<LINK REL="next" HREF="node15.html">
<LINK REL="previous" HREF="node13.html">
<LINK REL="up" HREF="node9.html">
<LINK REL="next" HREF="node15.html">
</HEAD>
<BODY >
<DIV CLASS="navigation"><!--Navigation Panel-->
<A NAME="tex2html178"
HREF="node15.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
SRC="/usr/share/latex2html/icons/next.png"></A>
<A NAME="tex2html176"
HREF="node9.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
SRC="/usr/share/latex2html/icons/up.png"></A>
<A NAME="tex2html170"
HREF="node13.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
SRC="/usr/share/latex2html/icons/prev.png"></A>
<BR>
<B> Next:</B> <A NAME="tex2html179"
HREF="node15.html">Part of Speech Tagging</A>
<B> Up:</B> <A NAME="tex2html177"
HREF="node9.html">Results</A>
<B> Previous:</B> <A NAME="tex2html171"
HREF="node13.html">Negation Tagging</A>
<BR>
<BR></DIV>
<!--End of Navigation Panel-->
<H2><A NAME="SECTION00065000000000000000">
Position Tagging</A>
</H2>
Reviews are split into a beginning, middle, and end, so to see if one section carries more sentiment than another, we split the reviews into a first quarter, a middle half, and a last quarter and tagged the words in each section.
<P>
Position tagging was not helpful. For bigrams, it harmed performance by around 5% in most cases, and for unigrams, it was not helpful. If reviews end up not actually following the model specified or if the model has no bearing on where the relevant data is, position tagging will be harmful because it increases the dimensionality of the input without increasing the information content. We suspect that is the case here.
<P>
<BR><HR>
<ADDRESS>
Pranjal Vachaspati
2012-02-05
</ADDRESS>
</BODY>
</HTML>