st: line plot

[mareikehahr@aol.com]

Dear Statalist,

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!?

Thanks in advance

Mareike

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