跪求：用MATLAB程序解决逐步回归

sofia

<>MATLAB 中逐步回归分析可以解决多变量下各因子对因变量的影响及效果。现有一题：</P>
<>已知四个楼盘均为别墅，各因子如下，试求哪几个因子影响较大（排出顺序）</P>
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<TABLE  cellSpacing=0 cellPadding=0 align=left border=1>

<TR>
<TD  vAlign=top width=44>
<P >楼盘</P></TD>
<TD  vAlign=top width=44>
<P >物业类别</P></TD>
<TD  vAlign=top width=44>
<P >物业状态</P></TD>
<TD  vAlign=top width=44>
<P >位置<FONT face="Times New Roman">(</FONT>记分<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=44>
<P >总占地<FONT face="Times New Roman">(</FONT>公顷<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=44>
<P >总套数</P></TD>
<TD  vAlign=top width=44>
<P >绿化率<FONT face="Times New Roman">(%)</FONT></P></TD>
<TD  vAlign=top width=44>
<P >配套设施<FONT face="Times New Roman">(</FONT>记分<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=44>
<P >户型<FONT face="Times New Roman">(</FONT>记分<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=44>
<P >车位<FONT face="Times New Roman">(</FONT>比例<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=44>
<P >原装修<FONT face="Times New Roman">(</FONT>记分<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=62>
<P >物业费<FONT face="Times New Roman">(</FONT>元<FONT face="Times New Roman">/</FONT>月<FONT face="Times New Roman">/</FONT>平方米<FONT face="Times New Roman">)</FONT></P></TD>
<TD  vAlign=top width=48>
<P >均价<FONT face="Times New Roman">(</FONT>元<FONT face="Times New Roman">/</FONT>平方米<FONT face="Times New Roman">)</FONT></P></TD></TR>
<TR>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=44>
<P >别墅</P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">0</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">2.2</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">600</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">50</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">9</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">14</FONT></P></TD>
<TD  vAlign=top width=62>
<P ><FONT face="Times New Roman">3.46</FONT></P></TD>
<TD  vAlign=top width=48>
<P ><FONT face="Times New Roman">8500</FONT></P></TD></TR>
<TR>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">8</FONT></P></TD>
<TD  vAlign=top width=44>
<P >别墅</P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">14</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">122</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">70</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">10</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">4</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">12</FONT></P></TD>
<TD  vAlign=top width=62>
<P ><FONT face="Times New Roman">4.5</FONT></P></TD>
<TD  vAlign=top width=48>
<P ><FONT face="Times New Roman">8800</FONT></P></TD></TR>
<TR>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">37</FONT></P></TD>
<TD  vAlign=top width=44>
<P >别墅</P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">4</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">49.9</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">317</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">46</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">8</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">19</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1.5</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">20</FONT></P></TD>
<TD  vAlign=top width=62>
<P ><FONT face="Times New Roman">6.84</FONT></P></TD>
<TD  vAlign=top width=48>
<P ><FONT face="Times New Roman">9000</FONT></P></TD></TR>
<TR>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">46</FONT></P></TD>
<TD  vAlign=top width=44>
<P >别墅</P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">4</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">13</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">105</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">65</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">11</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">4</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">12</FONT></P></TD>
<TD  vAlign=top width=62>
<P ><FONT face="Times New Roman">4.8</FONT></P></TD>
<TD  vAlign=top width=48>
<P ><FONT face="Times New Roman">8800</FONT></P></TD></TR></TABLE></P>
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<P  align=center><FONT size=3>我用MATLAB中的stepwise函数，但总是出错，望哪个强人加以指点，由于时间紧迫，能否尽快答复，不胜感激！！！！！！！！！！！</FONT></P>