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Ronan said
This is peculiar. On my system (OSX 10.5) with Stata 11, the graph
shows distinctly oval plot symbols, but when I resize the graph they
become more regular, without ever becoming proper circles. You can see
clearly what is happening. Resize the graph by dragging the corner of
the window. Stata waits until you release the drag before redrawing
the graph, so you can examine a the original graph - it's clearly
distorted.
I was judging only on the basis of what is produced as a PDF via graph export, as that can be magnified to any level to discern whether there are any irregularities. Making judgments based on screen rendition complicates the issue by introducing the particular system's graphics subsystem. That can also be relevant for PDF output, as Chinh N. at StataCorp explained to me recently, but it would not be an issue with, e.g., eps output, as that makes no use of the host machine's graphics capabilities. So perhaps the real acid test is whether .eps files produced with graph, nodraw and graph export whatever.eps contain any artifacts.
Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
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