m39 - creating and managing variables - 34 of 36.mht

sas的考试样题

          onmouseover=3D"window.status=3D'Display details on the WHEN =
statement.';"=20
          onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
          =
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_28.htm"><STRONG>WHEN<=
/STRONG><EM>-n=20
          (when-expression-1 &lt;..., when-expression-n&gt;) statement;=20
          </EM><STRONG>;</STRONG></A></FONT>=20
          <DD><FONT =
color=3D#003399>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A=20
          onmouseover=3D"window.status=3D'Display details on the WHEN =
statement.';"=20
          onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
          =
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_28.htm">&lt;<STRONG>O=
THERWISE=20
          </STRONG><EM>statement</EM><STRONG>;</STRONG>&gt;</A></FONT>=20
          <DD><FONT color=3D#003399><A=20
          onmouseover=3D"window.status=3D'Display details on the END =
statement.';"=20
          onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
          =
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_28.htm"><STRONG>END</=
STRONG>;</A></FONT>=20

          <DT><FONT =
color=3D#003399><STRONG>RUN;</STRONG><BR><STRONG>PROC PRINT=20
          DATA=3D</STRONG><EM>SAS-data set </EM><STRONG>LABEL;</STRONG> =
</FONT>
          <DT><FONT color=3D#003399><STRONG>RUN;</STRONG></FONT>=20
      </DT></DL></BLOCKQUOTE></TD></TR></TBODY></TABLE></CENTER>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" border=3D0>
  <TBODY>
  <TR>
    <TD align=3Dleft>
      <HR>
    </TD></TR></TBODY></TABLE><BR></CENTER><!-- InstanceEndEditable -->
<P><!-- InstanceBeginEditable name=3D"sampleprogram" -->
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" border=3D0>
  <TBODY>
  <TR>
    <TD align=3Dleft><STRONG><A name=3DSample>Sample =
Program</A></STRONG> <FONT=20
      color=3D#003399><PRE>     data clinic.stress;
        infile tests;
        input ID $ 1-4 Name $ 6-25 RestHR 27-29 MaxHR 31-33
              RecHR 35-37 TimeMin 39-40 TimeSec 42-43
              Tolerance $ 45;
        if tolerance=3D'D'and resthr ge 70 then delete;
        drop timemin timesec;
        TotalTime=3D(timemin*60)+timesec;
        retain SumSec 5400;
        sumsec+totaltime;
        length TestLength $ 6;
        if totaltime&gt;800 then testlength=3D'Long';
        else if 750&lt;=3Dtotaltime&lt;=3D800 then =
testlength=3D'Normal';
        else if totaltime&lt;750 then TestLength=3D'Short';
        label sumsec=3D'Cumulative Total Seconds (+5,400)';
        format sumsec comma6.;
     run;</PRE></FONT>
      <P>
      <HR>
    </TD></TR></TBODY></TABLE><BR><!-- InstanceEndEditable -->
<P><!-- InstanceBeginEditable name=3D"pointstoremember" -->
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" border=3D0>
  <TBODY>
  <TR>
    <TD align=3Dleft><STRONG><A name=3DPoints>Points to=20
      Remember</A></STRONG><STRONG><A name=3DPoints></A></STRONG>=20
      <UL>
        <LI>Like the assignment statement, the sum statement does not =
contain a=20
        keyword. <BR><BR>
        <LI>If the expression in a sum statement produces a missing =
value, the=20
        sum statement ignores it. (Remember, however, that assignment =
statements=20
        assign a missing value if the expression produces a missing=20
        value.)<BR><BR>
        <LI>Using ELSE statements with IF-THEN statements can save =
resources.=20
        For greater efficiency, construct your IF-THEN/ELSE statements =
with=20
        conditions of decreasing probability. <BR><BR>
        <LI>Make sure the LENGTH statement appears before any other =
reference to=20
        the variable in the DATA step. If the variable has been created =
by=20
        another statement, a later use of the LENGTH statement will not =
change=20
        its size.<BR><BR>
        <LI>Labels and formats do not affect how data is stored in the =
data set,=20
        only how it appears in output. You assign labels and formats =
temporarily=20
        in PROC steps and permanently in DATA steps.=20
</LI></UL></TD></TR></TBODY></TABLE><!-- InstanceEndEditable =
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  <TR>
    <TD>&nbsp;</TD>
    <TD vAlign=3Dtop><FONT face=3D"Verdana, Arial, Helvetica, Sans =
Serif"=20
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      face=3D"Arial, Helvetica, sans-serif">Copyright</FONT></A> <FONT=20
      face=3D"Arial, Helvetica, sans-serif">=A9 2003 SAS Institute Inc., =
Cary, NC,=20
      USA. All rights reserved.</FONT></FONT> <FONT=20
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      <DIV align=3Dright><A=20
      onmouseover=3D"rOver('back2');window.status=3D'Display the =
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      accessKey=3Db =
onmouseout=3D"rOut('back2');window.status=3D'';return true"=20
      href=3D"javascript:%20prevPage()"><IMG height=3D19 alt=3Dback=20
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<P>&nbsp;</P>
<SCRIPT>writeLessonDiv()</SCRIPT>

<SCRIPT>writeHelpDiv()</SCRIPT>
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