Thanks to Kit Baum, a new package called addplot is available from SSC. Stata 9 is required.
addplot adds twoway plot objects to an existing twoway graph. This is useful if you want to add additional objects such as titles or extra data points to a twoway graph after it has been created. Most of what addplot can do, can also be done by rerunning the original graph command including additional options or plot statements. addplot, however, might be useful if you have to modify a graph for which you cannot rerun the original command, for example, because you only have the graph file but not the data that were used to create the graph. Furthermore, addplot can do certain things that would be difficult to achieve in a single graph command (e.g. customizing individual subgraphs within a by-graph). addplot also provides a substitute for some of the functionality of the graph editor.
Here's an example where individual reference lines are added to the subgraphs of a by-graph:
ben
addplot adds twoway plot objects to an existing twoway graph. This is useful if you want to add additional objects such as titles or extra data points to a twoway graph after it has been created. Most of what addplot can do, can also be done by rerunning the original graph command including additional options or plot statements. addplot, however, might be useful if you have to modify a graph for which you cannot rerun the original command, for example, because you only have the graph file but not the data that were used to create the graph. Furthermore, addplot can do certain things that would be difficult to achieve in a single graph command (e.g. customizing individual subgraphs within a by-graph). addplot also provides a substitute for some of the functionality of the graph editor.
Here's an example where individual reference lines are added to the subgraphs of a by-graph:
Code:
sysuse auto scatter mpg turn, by(foreign) jitter(2) msymbol(Oh) summarize mpg if foreign==0, meanonly addplot 1: , yline(`r(mean)') norescaling summarize mpg if foreign==1, meanonly addplot 2: , yline(`r(mean)') norescaling summarize mpg, meanonly addplot: , yline(`r(mean)', lpattern(dash)) norescaling
ben
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