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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!? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/