There is a nice discussion on Andrew Gelman's blog about the relative merits of maps and graphs for displaying statistical information. The important thing is not to think about how pretty the picture is, but about how to communicate the message to the reader most effectively. All purveyors of STATA graph defaults should think well on't.
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How to combine two variables in R
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In this video, we see that in R/Rstudio, we can two variables with a plus
sign: mydat$z = mydat$x + mydat$y — just make sure it’s reasonable to
combine them.
2 hours ago
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