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st: RE: line plot


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: line plot
Date   Mon, 10 May 2010 13:53:55 +0100

There is a difference of principle here. 

-graph bar-, -graph dot- and -graph box- are reduction commands that
typically show summary statistics derived from the data, rather the data
themselves. (There are exceptions, flagged by -asis-.)

On the other hand, most -twoway- commands, and those based on them, how
the data directly. (There are exceptions, such as -histogram-.) Thus,
for the most part, you need to do any reductions beforehand. 

Use -egen, total()- to calculate the sums beforehand. Note also -egen,
tag()- to tag just one observation of each kind, in your case, one
observation for each year. 

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

Mareike

I'm working with panel data and I'm trying to plot the yearly sum of 
one variable for all countries over time. I was able to create a bar 
diagram for that purpose by using the command: graph bar (sum) 
variable, over(year). But actually I would prefer to present the 
numbers in form of a line plot: But all the commands I could think of 
(e.g. tsline, line, twoway connected, etc.) do not allow the 
sum-option, as far as I understand them correctly. It would be great if 
anybody of you would get up with an idea!?


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