How can I suppress legend keys for variables without data? Let me
illustrate this with a meaningless example from the auto data.
. sysuse auto
. scatter headroom rep78 mpg
The scatterplot has a legend with two keys, "Headroom (in.)" and
"Repair Record 1978". Now I replace all values for headroom with
missing values and draw the scatterplot again.
. replace headroom=.
. scatter headroom rep78 mpg
The legend still has two keys although only the repair record appears
in the graph.
Is it possible to instruct Stata to only show keys for data that
appears in the graph? I am thinking of something like "show legend
for headroom if headroom is not missing and show legend for rep78 if
rep78 is not missing".
Thank you,
Friedrich Huebler
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