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Add Mean Trend Line to geom_line plot + R
I need to add an average trend line to a geom_line line plot in R. The result should be a dotted line on the same chart that that is the average of the values that make up the other lines, like so:
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3
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ggplot2: add line for average per group (Error: No stat called StatHline.)
I recently updated ggplot2 package and running into major issues drawing horizontal lines for averages per group using facets.
I believe this post is no longer valid?
I am creating a time series ...
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