Dear List,
I have data of patients aggregated on a city level. And I have the longitude and latitude of the cities.
What I am trying to analyse is the relationship between various symptoms and their geographical distribution.
I found scatterplots to be very informative with e.g. longitude on the x-axis and one symptom on the y-axis. The dots represent the cities and a regression line shows the correlation.
What I would like to have is such a scatterplot if I control for another variable. Does anybody know a way to do that? Or any other suggestions how to visualize such a partial correlation?
Thanks a lot in advance,
Mark
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