SAS中文论坛

标题: SAS EM：Data Partition node(数据拆分节点) [打印本页]

作者: shiyiming 时间: 2010-10-22 22:51
标题: SAS EM：Data Partition node(数据拆分节点)
From supersasmacro's blog on Sina

<div>SAS EM：Data Partition node(数据拆分节点)</DIV>
<div><br /></DIV>
<div>SAS EM(Enterprise Miner)企业数据挖掘节点功能详解及代码实现（第二弹）</DIV>
<div><br /></DIV>
<div>本文未经作者允许，请勿转载</DIV>
<div><br /></DIV>
<div>Data Partition
node(数据拆分节点)允许用户拆分数据做为训练、验证及测试等目的。拆分数据有助于加速模块开发。此外数据拆分也提供相互独立的数据做为交叉验证和模块评估之用。主要以简单、分层随机或自定义的抽样为基础。在做完抽样之后，你可以对将资料拆分成几个互斥的子集合，使用互斥的集合可使得评估模式更为精确。在这边可设定的参数，除了抽样方法、样本大小和随机数种子之外，必须分别决定训练、验证和测试集合所占的比例。</DIV>
<div> <a href="http://blog.photo.sina.com.cn/showpic.html#url=http://static9.photo.sina.com.cn/orignal/5d3b177cg8b570e539ab8" TARGET="_blank"><img SRC="http://static9.photo.sina.com.cn/middle/5d3b177cg8b570e539ab8&690" WIDTH="500" HEIGHT="300" /></A></DIV>
<br />
<div>SAS EM提供了三种数据拆分的方式，主要有简单随机数据拆分，层次数据拆分以及用户自定义的数据拆分：</DIV>
<div>数据拆分(Data
Partition)，将数据集按照40%，30%和30%的比例拆分成相互独立的数据集，训练集、验证集和测试集。训练集用于拟合可供选择的模型，验证集用于选择合适的模型，测试集用于对模型效果进行评估测试。</DIV>
<div>1 简单随机数据拆分(Simple Random)</DIV>
<div>随机地将数据分到三个数据集中。</DIV>
<div> <a href="http://blog.photo.sina.com.cn/showpic.html#url=http://static5.photo.sina.com.cn/orignal/5d3b177cg8b570f5887f4" TARGET="_blank"><img SRC="http://static5.photo.sina.com.cn/middle/5d3b177cg8b570f5887f4&690" WIDTH="495" HEIGHT="189" /></A></DIV>
<br />
<div>代码如下：</DIV>
<div>*先得到EM数据集；</DIV>
<div>data EMDATA.VIEW_4O9 / view=EMDATA.VIEW_4O9;</DIV>
<div> set EMSAMPLE.BUYTEST;</DIV>
<div>run;</DIV>
<div>* 设置随机种子为 12345;</DIV>
<div>%let seed = 12345; </DIV>
<div><br /></DIV>
<div>* 随机拆分，得到三个数据集</DIV>
<div>data EMDATA.TRNAB45E </DIV>
<div>    
EMDATA.VALN980S </DIV>
<div>    
EMDATA.TSTJIB82; </DIV>
<div>     drop
_c00: _partseed; </DIV>
<div> set EMDATA.VIEW_4O9; </DIV>
<div>    
_partseed = ranuni(12345); </DIV>
<div>**这里，因为SAS
EM已经得到原始数据集为10000个，并且三个要得到的数据集的大小分别是40%:30%:30%，因此，这里直接就用4000,3000,3000来进行计算。我们写代码的时候，得先确定样本的总数，然后再将这个总数作为参数写入代码中;</DIV>
<div>     if
(10000 +1-_n_)*_partseed <= (4000 - _c000001) then
do; </DIV>
<div>    
   _c000001 +
1; </DIV>
<div>    
   output
EMDATA.TRNAB45E; </DIV>
<div>    
end; </DIV>
<div>     else
if (10000 +1-_n_)*_partseed <= (4000 - _c000001 +
3000 - _c000002) then do;</DIV>
<div>    
   _c000002 +
1; </DIV>
<div>    
   output
EMDATA.VALN980S; </DIV>
<div>    
end; </DIV>
<div>     else
do; </DIV>
<div>    
   _c000003 +
1; </DIV>
<div>    
   output
EMDATA.TSTJIB82; </DIV>
<div>    
end; </DIV>
<div>run;</DIV>
<div><br /></DIV>
<div><br /></DIV>
<div>2 层次数据拆分(Stratitied Partition)</DIV>
<div>层次数据拆分，就是按照某一个变量进行分层，每个层的数据再进行数据拆分。例如：</DIV>
<div> <a href="http://blog.photo.sina.com.cn/showpic.html#url=http://static13.photo.sina.com.cn/orignal/5d3b177cg8b5711213a5c" TARGET="_blank"><img SRC="http://static13.photo.sina.com.cn/middle/5d3b177cg8b5711213a5c&690" WIDTH="497" HEIGHT="211" /></A></DIV>
<br />
<div>这里，我们对sex这个变量进行层次数据拆分</DIV>
<div> <a href="http://blog.photo.sina.com.cn/showpic.html#url=http://static3.photo.sina.com.cn/orignal/5d3b177cg8b571238e152" TARGET="_blank"><img SRC="http://static3.photo.sina.com.cn/middle/5d3b177cg8b571238e152&690" WIDTH="690" HEIGHT="236" /></A></DIV>
<br />
<div>代码如下：</DIV>
<div>*首先查看sex这个变量各个值的样本数；</DIV>
<div>proc freq data=EMDATA.VIEW_4O9; </DIV>
<div>     format
SEX $1.; </DIV>
<div>     table
SEX /out=EMPROJ._FRQKJRU(drop=percent); </DIV>
<div>run;</DIV>
<div> </DIV>
<div>proc sort data=EMPROJ._FRQKJRU; </DIV>
<div>     by
descending count; </DIV>
<div>run; </DIV>
<div><br /></DIV>
<div>**查看每个值的样本数是否大于3，如果小于3，则层次拆分无意义，故删除。这些值都可以自己设置;</DIV>
<div>data EMPROJ._FRQV3ZL(keep=count); </DIV>
<div> set EMPROJ._FRQKJRU; </DIV>
<div>     where
(.01 * 40 * count) >= 3; </DIV>
<div>run;</DIV>
<div><br /></DIV>
<div>
*开始层次拆分:这里，通过上面的freq过程步，我们就已经知道了sex的各个值的样本数，然后EM会计算出有多少个样本会拆分到三个数据集中;</DIV>
<div>即：最终结果： </DIV>
<div>
<table BORDER="1" CELLSPACING="0" CELLPADDING="0" STYLE="margin-left:.4pt;border-collapse:collapse;border:none;mso-border-alt: outset #111111 .75pt;mso-yfti-tbllook:1184;mso-padding-alt:0cm 0cm 0cm 0cm">
<tbody>
<tr STYLE="mso-yfti-irow:0;mso-yfti-firstrow:yes;height:22.5pt">
<td STYLE="border:inset #111111 1.0pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:22.5pt">
<p ALIGN="center" STYLE="text-align:center;mso-pagination:widow-orphan"><b><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
性别</SPAN></B></P>
</TD>
<td STYLE="border:inset #111111 1.0pt;border-left:none;mso-border-left-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:22.5pt">
<p ALIGN="center" STYLE="text-align:center;mso-pagination:widow-orphan"><b><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
总体</SPAN></B></P>
</TD>
<td STYLE="border:inset #111111 1.0pt;border-left:none;mso-border-left-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:22.5pt">
<p ALIGN="center" STYLE="text-align:center;mso-pagination:widow-orphan"><b><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
训练集</SPAN></B><b><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">(40%)</SPAN></B></P>
</TD>
<td STYLE="border:inset #111111 1.0pt;border-left:none;mso-border-left-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:22.5pt">
<p ALIGN="center" STYLE="text-align:center;mso-pagination:widow-orphan"><b><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
验证集</SPAN></B><b><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">(30%)</SPAN></B></P>
</TD>
<td STYLE="border:inset #111111 1.0pt;border-left:none;mso-border-left-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:22.5pt">
<p ALIGN="center" STYLE="text-align:center;mso-pagination:widow-orphan"><b><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
测试集</SPAN></B><b><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">(30%)</SPAN></B></P>
</TD>
</TR>
<tr STYLE="mso-yfti-irow:1;height:18.75pt">
<td STYLE="border:inset #111111 1.0pt;border-top:none;mso-border-top-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:18.75pt">
<p ALIGN="left" STYLE="text-align:left;mso-pagination:widow-orphan"><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
女</SPAN><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">(F)</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">4489</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">1796</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">1347</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">1347</SPAN></P>
</TD>
</TR>
<tr STYLE="mso-yfti-irow:2;height:18.75pt">
<td STYLE="border:inset #111111 1.0pt;border-top:none;mso-border-top-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:18.75pt">
<p ALIGN="left" STYLE="text-align:left;mso-pagination:widow-orphan"><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
男</SPAN><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">(M)</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">5277</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">2111</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">1583</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:18.75pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">1583</SPAN></P>
</TD>
</TR>
<tr STYLE="mso-yfti-irow:3;mso-yfti-lastrow:yes;height:22.5pt">
<td STYLE="border:inset #111111 1.0pt;border-top:none;mso-border-top-alt: inset #111111 .75pt;mso-border-alt:inset #111111 .75pt;padding:0cm 0cm 0cm 0cm; height:22.5pt">
<p ALIGN="left" STYLE="text-align:left;mso-pagination:widow-orphan"><span STYLE="mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:Gulim; mso-hansi-font-family:Gulim;mso-bidi-font-family:Gulim;mso-font-kerning:0pt">
缺失</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:22.5pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">234</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:22.5pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">94</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:22.5pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">70</SPAN></P>
</TD>
<td STYLE="border-top:none;border-left:none;border-bottom:inset #111111 1.0pt; border-right:inset #111111 1.0pt;mso-border-top-alt:inset #111111 .75pt; mso-border-left-alt:inset #111111 .75pt;mso-border-alt:inset #111111 .75pt; padding:0cm 0cm 0cm 0cm;height:22.5pt">
<p ALIGN="right" STYLE="text-align:right;mso-pagination:widow-orphan"><span LANG="EN-US" STYLE="mso-bidi-font-size:10.5pt;font-family:"Courier new"; mso-fareast-font-family:宋体;mso-font-kerning:0pt;mso-fareast-language:Ko" XML:LANG="EN-US">70</SPAN></P>
</TD>
</TR>
</TBODY>
</TABLE>
</DIV>
<div>以下的代码就是根据上表来生成的。这里，我们在写代码的时候，可以根据参数来实现。</DIV>
<div>%let seed = 12345; </DIV>
<div>data EMDATA.TRNAB45E </DIV>
<div>    
EMDATA.VALN980S </DIV>
<div>    
EMDATA.TSTJIB82; </DIV>
<div>     drop
_c00: _partseed; </DIV>
<div> set EMDATA.VIEW_4O9; </DIV>
<div>     length
_Pformat1 $200; </DIV>
<div>     drop
_Pformat1; </DIV>
<div>    
_Pformat1 = trim(left(put(SEX,$1.))); </DIV>
<div>     if
_Pformat1 = 'M' then do; </DIV>
<div>    
   _partseed =
ranuni(12345); </DIV>
<div>    
   if (5277
+1-_c000004)*_partseed <= (2111 - _c000001) then do;
 </DIV>
<div>    
      _c000001 +
1; </DIV>
<div>    
      output
EMDATA.TRN986YZ; **男，训练集；</DIV>
<div>    
   end; </DIV>
<div>    
   else if (5277
+1-_c000004)*_partseed <= (2111 - _c000001 + 1583 -
_c000002) then do;</DIV>
<div>    
      _c000002 +
1;  </DIV>
<div>    
      output
EMDATA.VALQDIJU; **男，验证集；</DIV>
<div>    
   end; </DIV>
<div>    
   else
do; </DIV>
<div>    
      _c000003 +
1; </DIV>
<div>    
      output
EMDATA.TSTQDKTQ; **男，测试集；</DIV>
<div>    
   end; </DIV>
<div>    
 
 _c000004+1; </DIV>
<div>    
end; </DIV>
<div>     else
if _Pformat1 = 'F' then do; </DIV>
<div>    
   _partseed =
ranuni(12345); </DIV>
<div>    
   if (4489
+1-_c000008)*_partseed <= (1796 - _c000005) then
do; </DIV>
<div>    
      _c000005 +
1; </DIV>
<div>    
      output
EMDATA.TRN986YZ; **女，训练集；</DIV>
<div>    
   end; </DIV>
<div>    
   else if (4489
+1-_c000008)*_partseed <= (1796 - _c000005 + 1347 -
_c000006) then do;</DIV>
<div>    
      _c000006 +
1; </DIV>
<div>    
      output
EMDATA.VALQDIJU; **女，验证集；</DIV>
<div>    
   end; </DIV>
<div>    
   else
do; </DIV>
<div>    
      _c000007 +
1; </DIV>
<div>    
      output
EMDATA.TSTQDKTQ; **女，测试集；</DIV>
<div>    
   end; </DIV>
<div>    
 
 _c000008+1; </DIV>
<div>    
end; </DIV>
<div>     else
if _Pformat1 = '' then do; </DIV>
<div>    
   _partseed =
ranuni(12345); </DIV>
<div>    
   if (234 +1-_c000012)*_partseed
<= (94 - _c000009) then do; </DIV>
<div>    
      _c000009 +
1; </DIV>
<div>    
      output
EMDATA.TRN986YZ; **sex为缺失，训练集；</DIV>
<div>    
   end; </DIV>
<div>    
   else if (234
+1-_c000012)*_partseed <= (94 - _c000009 + 70 -
_c000010) then do; </DIV>
<div>    
      _c000010 +
1; </DIV>
<div>    
      output
EMDATA.VALQDIJU; **sex为缺失，验证集；</DIV>
<div>    
   end; </DIV>
<div>    
   else
do; </DIV>
<div>    
      _c000011 +
1; </DIV>
<div>    
      output
EMDATA.TSTQDKTQ; **sex为缺失，测试集；</DIV>
<div>    
   end; </DIV>
<div>    
 
 _c000012+1; </DIV>
<div>    
end; </DIV>
<div>run;</DIV>
<div> </DIV>
<div><br /></DIV>
<div>3 用户自定义数据拆分(USER DEFINDED)</DIV>
<div>用户自定义数据拆分可以根据不同的变量，这些变量的不同的值进行拆分。</DIV>
<div> <a href="http://blog.photo.sina.com.cn/showpic.html#url=http://static1.photo.sina.com.cn/orignal/5d3b177cg8b57158870c0" TARGET="_blank"><img SRC="http://static1.photo.sina.com.cn/middle/5d3b177cg8b57158870c0&690" WIDTH="492" HEIGHT="190" /></A></DIV>
<br />
<div>
例如：我们根据BUY12这个变量的值进行拆分，其中，当BUY12=0时，为训练集，当BUY12=1时，为验证集，当BUY12=2时，为测试集。</DIV>
<div> <a href="http://blog.photo.sina.com.cn/showpic.html#url=http://static14.photo.sina.com.cn/orignal/5d3b177cg8b57168dc5ad" TARGET="_blank"><img SRC="http://static14.photo.sina.com.cn/middle/5d3b177cg8b57168dc5ad&690" WIDTH="491" HEIGHT="197" /></A></DIV>
<br />
<div>代码如下：</DIV>
<div>**当BUY12=0时，创建训练集；</DIV>
<div>proc sql; </DIV>
<div>  create view
EMDATA.TRNAB45E as </DIV>
<div>    select
* </DIV>
<div>    from
EMDATA.VIEW_4O9 </DIV>
<div>    where
trim(left(put(BUY12,BEST12.))) = '0'; </DIV>
<div>quit;</DIV>
<div>**当BUY12=1时，创建验证集；</DIV>
<div>proc sql; </DIV>
<div>  create view
EMDATA.VALN980S as </DIV>
<div>    select
* </DIV>
<div>    from
EMDATA.VIEW_4O9 </DIV>
<div>    where
trim(left(put(BUY12,BEST12.))) = '1'; </DIV>
<div>quit;</DIV>
<div>**当BUY12=2时，创建测试集；</DIV>
<div>proc sql; </DIV>
<div>  create view
EMDATA.TSTJIB82 as </DIV>
<div>    select
* </DIV>
<div>    from
EMDATA.VIEW_4O9 </DIV>
<div>    where
trim(left(put(BUY12,BEST12.))) = '2'; </DIV>
<div>quit;</DIV>
<div><br /></DIV>
<div><br /></DIV>
<div><br /></DIV>
<div>本文用到的SAS数据集为buytest.sas7bdat，其下载地址：</DIV>
<div><a class="postlink" href="http://ishare.iask.sina.com.cn/f/8641118.html">http://ishare.iask.sina.com.cn/f/8641118.html</a></DIV>
<div>本系列全部数据下载地址：</DIV>
<div><a class="postlink" href="http://iask.sina.com.cn/u/1564153724/ish">http://iask.sina.com.cn/u/1564153724/ish</a></DIV>
<div><br /></DIV><div style="border-top: 1px solid rgb(203, 217, 217); padding-top: 20px; padding-bottom: 10px;">
<p><br><a href="http://move.blog.sina.com.cn/admin/blogmove/blogmove_msn.php" target="_blank">MSN空间完美搬家到新浪博客!</a></p></div>

欢迎光临 SAS中文论坛 (https://mysas.net/forum/)