ggplot2 warning: Stacking not well defined when ymin != 0

Question

Perhaps the answer is to just be warned. I am attmepting to use a scaled and centered variable to look at how observations differ from the mean value. This plot is a commo

Answer 1

1) Either by adding position = "identity" to geom_bar or, of course, by using

suppressWarnings(print(ggplot(...)))

2-3) Considering the technical side - yes, you can ignore it. The reason for this warning is related to interpreting that bars have negative height instead of just negative values.