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
[email protected]
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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