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<HTML> <HEAD> <!--SCRIPT LANGUAGE="JavaScript" SRC="http://a1835.g.akamai.net/f/1835/276/3h/www.netlibrary.com/include/js/dictionary_library.js"></SCRIPT> <SCRIPT LANGUAGE="JavaScript"> if (!opener){document.onkeyup=parent.turnBookPage;} </SCRIPT!--> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="-1"><META http-equiv="Content-Type" content="text/html; charset=windows-1252"><SCRIPT>var PrevPage="Page_132";var NextPage="Page_134";var CurPage="Page_133";var PageOrder="143";</SCRIPT> <TITLE>Document</TITLE> </HEAD> <BODY BGCOLOR="#FFFFFF"><CENTER><TABLE BORDER=0 WIDTH=100% CELLPADDING=0><TR><TD ALIGN=CENTER> <TABLE BORDER=0 CELLPADDING=2 CELLSPACING=0 WIDTH=100%> <TR> <TD ALIGN=LEFT><A HREF='Page_132.html'>Previous</A></TD> <TD ALIGN=RIGHT><A HREF='Page_134.html'>Next</A></TD> </TR> </TABLE></TD></TR><TR><TD ALIGN=LEFT><P><A NAME='JUMPDEST_Page_133'/><A NAME='{477}'/><TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 WIDTH='100%'><TR><TD ALIGN=RIGHT><FONT FACE='Times New Roman, Times, Serif' SIZE=2 COLOR=#FF0000>Page 133</FONT></TD></TR></TABLE><A NAME='{478}'/><TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0><TR> <TD ROWSPAN=5></TD> <TD COLSPAN=3 HEIGHT=12></TD> <TD ROWSPAN=5></TD></TR><TR> <TD COLSPAN=3></TD></TR><TR><TD></TD> <TD><FONT FACE='Times New Roman, Times, Serif' SIZE=3>smoothing data is to reduce the number of distinct values for a feature. A similar technique can be used to "discretize" continuous features into a set of true-or-false features, each covering a fixed range of values.</FONT></TD><TD></TD></TR><TR> <TD COLSPAN=3></TD></TR><TR> <TD COLSPAN=3 HEIGHT=1></TD></TR></TABLE><A NAME='{479}'/><TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0><TR> <TD ROWSPAN=5></TD> <TD COLSPAN=3 HEIGHT=12></TD> <TD ROWSPAN=5></TD></TR><TR> <TD COLSPAN=3></TD></TR><TR><TD></TD> <TD><FONT FACE='Times New Roman, Times, Serif' SIZE=3>Missing data presents a unique problem, especially if you are using a neural network tool, since they cannot deal with missing values. Most modern data mining tools provide options on how to deal with missing values. Care should be taken, however, on whether a missing value represents a negative response that needs to be recoded and used. Consider replacing all missing values with a zero or an average mean. The drawback to this is that the replaced value is not correct. Lastly, randomly extract a sample of the data, especially if you are dealing with a large database, and start with a small prototype model. Start small and expand with your data mining analysis. For example, rather than constructing multiple response models for all the products in your retailing site, you may want to test only a few for your major product lines.</FONT><FONT FACE='Times New Roman, Times, Serif' SIZE=3 COLOR=#FFFF00><!-- break --></FONT></TD><TD></TD></TR><TR> <TD COLSPAN=3></TD></TR><TR> <TD COLSPAN=3 HEIGHT=1></TD></TR></TABLE><A NAME='{47A}'/><TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0><TR> <TD ROWSPAN=5></TD> <TD COLSPAN=3 HEIGHT=12></TD> <TD ROWSPAN=5></TD></TR><TR> <TD COLSPAN=3></TD></TR><TR><TD></TD> <TD><FONT FACE='Times New Roman, Times, Serif' SIZE=3><B><I>Enhancing Your Data</I></B></FONT></TD><TD></TD></TR><TR> <TD COLSPAN=3></TD></TR><TR> <TD COLSPAN=3 HEIGHT=1></TD></TR></TABLE><A NAME='{47B}'/><TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH='100%'><TR><TD HEIGHT=12></TD></TR><TR><TD><TABLE CELLSPACING=0 BGCOLOR=#C0C0C0 BORDER=1 BORDERCOLOR=#000000 WIDTH=614 CELLPADDING=5><TR><TD COLSPAN=2 WIDTH=614 VALIGN=TOP><TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 WIDTH='100%'><TR><TD ALIGN=CENTER><FONT FACE='Times New Roman, Times, Serif' SIZE=2>One of the strategies you may want to take in preparing your data for mining is linking it to other databases your company may already have form production files. For example, here are a few file types with their content:</FONT></TD></TR></TABLE></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2><B>Company File Types</B></FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2><B>Content</B></FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Transactional Data</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Type of Products or Services Sold</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>ZIP Code or Customer Demographics</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Gender, Age, Income Level, Children</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Outbound Mail</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Response, Location, Household Data</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Telemarketing</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Response Rate, Number or Mailings</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Customer Information</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Total Number of Sales, Client Since Date</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Data Warehouse</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Customer Profile by Product and Service</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Datamart</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Customer Profile by Division or Branch</FONT></TD></TR><TR><TD WIDTH=250 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Consumer Credit Report</FONT></TD><TD WIDTH=365 VALIGN=TOP><FONT FACE='Times New Roman, Times, Serif' SIZE=2>Credit/Debit Cards, Occupation, Mortgage</FONT></TD></TR></TABLE></TD></TR></TABLE><BR><A NAME='{47C}'/></FORM></P></TD></TR></TABLE><P><FONT SIZE=0 COLOR=WHITE></CENTER><A NAME="bottom"> </A><!-- netLibrary.com Copyright Notice --> </BODY></HTML>⌨️ 快捷键说明
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