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st: RE: Help making graph: connecting pre- and post- for 22 individuals


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Help making graph: connecting pre- and post- for 22 individuals
Date   Fri, 4 Jun 2004 14:30:50 +0100

Check out -linkplot- and -pairplot- from SSC. 

(Even with Stata 8 graphics there are now 
several user-written extras.) 

My own bias is that the most effective graph 
in such circumstances usually is one of 
those given by -pairplot-. 

Also check one of my favourite little papers: 

McNeil, D.R. 1992. On graphing paired data.  American
        Statistician 46, 307-11.

Nick 
n.j.cox@durham.ac.uk 

Erik Beecroft
> 
> I am using Stata 8 intercooled for Windows.
> 
> I want to make a graph showing growth in reading levels 
> between the Fall
> term and Spring term for 22 students. The data look like this:
> 
> student fall    spring
> 1       4.5     5.25
> 2       3.5     5.25
> 3       7.5     7.5
> 4       5.75    5.75
> 5       6.5     7.5
> 6       6.25    7.5
> 7       4.5     5.25
> 8       6.5     7.25
> 9       4.75    5.5
> 10      4.5     5.25
> 11      6.25    6.25
> 12      4.5     5.25
> 13      4.5     5.25
> 14      2.25    3.25
> 15      6.5     7.25
> 16      4.75    5.25
> 17      4.75    5.25
> 18      6.5     6.75
> 19      5.75    5.75
> 20      4.75    5.75
> 21      4.5     4.75
> 22      4.5     5.5
> 
> I would like one graph, with 22 lines, one per student.  The 
> x axis would
> be term, with two values, Fall and Spring.  The y axis would 
> be reading
> level. So the graph would show a line connecting Fall and 
> Spring reading
> levels for each student.
> 
> I have spent two hours trying to make this graph, using the 
> Stata graphics
> manual and "A Visual Guide to Stata Graphics."
> 
> I re-shaped the data to have 2 records per student, one for 
> Fall and one
> for Spring. I then tried a connected line graph, but the 
> graph connected
> lines _across_ students, not just within students.
> 
> I also re-shaped the data so that the scores for each student were a
> separate variable (i.e., two records, one for Fall and one 
> for Spring, with
> 22 variables, each showing the scores for an individual 
> student).  I then
> tried "twoway (line stu1-stu22 Term)", but it looks like only 
> the first 15
> lines were drawn, I suppose due to a limit in how many 
> variables can be included in one graph.

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