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<p class=MsoNormal>Thanks for the invaluable help on my previous questions. The
speed up in create summary tables has been immense and I’m enthused about
all the possibilities going forward.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m currently stuck in trying to put together syntax
for a “long” for table. In the example below, each case is a unique
Student by Year combination. What I’m trying to do is take<o:p></o:p></p>
<p class=MsoNormal>such a table, aggregate on the student’s current
year (i.e., 2009 in this data) SCHOOL_NUMBER, and calculate their mean score in
the previous year (i.e., 2008 in this data). <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If the file were “wide”, with each case
representing a unique student with separate variables for the year, then it
would be easy to break on the 2009 SCHOOL_NUMBER and take the<o:p></o:p></p>
<p class=MsoNormal>mean of the 2008 SCORE.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is conversion of long to wide necessary to do this?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> STUDENT_ID SCHOOL_NUMBER YEAR
SCORE<o:p></o:p></p>
<p class=MsoNormal> [1,]
1 100
2008 39<o:p></o:p></p>
<p class=MsoNormal> [2,]
1 200
2009 48<o:p></o:p></p>
<p class=MsoNormal> [3,]
2 100
2008 64<o:p></o:p></p>
<p class=MsoNormal> [4,]
2 200
2009 73<o:p></o:p></p>
<p class=MsoNormal> [5,]
3 100
2008 35<o:p></o:p></p>
<p class=MsoNormal> [6,]
3 200
2009 35<o:p></o:p></p>
<p class=MsoNormal> [7,]
4 100
2008 52<o:p></o:p></p>
<p class=MsoNormal> [8,]
4 200
2009 61<o:p></o:p></p>
<p class=MsoNormal> [9,]
5 100
2008 51<o:p></o:p></p>
<p class=MsoNormal>[10,]
5 200
2009 58<o:p></o:p></p>
<p class=MsoNormal>[11,]
6 300
2008 45<o:p></o:p></p>
<p class=MsoNormal>[12,] 6
400 2009 55<o:p></o:p></p>
<p class=MsoNormal>[13,]
7 300
2008 69<o:p></o:p></p>
<p class=MsoNormal>[14,]
7 400
2009 77<o:p></o:p></p>
<p class=MsoNormal>[15,]
8 300
2008 47<o:p></o:p></p>
<p class=MsoNormal>[16,]
8 400
2009 47<o:p></o:p></p>
<p class=MsoNormal>[17,]
9 300
2008 57<o:p></o:p></p>
<p class=MsoNormal>[18,] 9
400 2009 58<o:p></o:p></p>
<p class=MsoNormal>[19,]
10 300
2008 47<o:p></o:p></p>
<p class=MsoNormal>[20,]
10 400
2009 53<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Damian<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Damian Betebenner<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal>Center for Assessment<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal>PO Box 351<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal>Dover, NH 03821-0351<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:navy'> <o:p></o:p></span></p>
<p class=MsoNormal>Phone (office): (603) 516-7900<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal>Phone (cell): (857) 234-2474<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal>Fax: (603) 516-7910<span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'><a
href="mailto:dbetebenner@nciea.org"><span style='color:blue'>dbetebenner@nciea.org</span></a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'><a
href="http://www.nciea.org/"><span style='color:blue'>www.nciea.org</span></a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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