parameter to change total area in geom_violin()?

[Alexander Shenkin]

Hi Folks,

Is there any way to make geom_violin() produce violins with larger or
smaller total areas? I have some plots but would like to make their
areas fatter (while still keeping total areas of different violins equal).

Thanks,
Allie

[Alexander Shenkin]

Just wanted to follow up with an example:

df = data.frame(y = c(rnorm(200)*30, rnorm(100)), x = factor(c(rep(c("class1","class2","class3","class4","class5"),length.out=200),rep("class6",100))))
ggplot(data=df, aes(x = x, y = y)) + geom_violin()



It seems that geom_violin scales the areas of each shape such that the width of the widest violin is a constant.  In the case above, this scaling makes the thinner violins difficult to interpret.  It would be nice to be able to modify that maximum width such that the total areas of each shape is increased, and all shapes become a bit fatter as a result.

Any thoughts?

Thanks,
allie

[Ista Zahn]

You can change the width, e.g.,

ggplot(data=df, aes(x = x, y = y)) + geom_violin(width = 2)

but the distributions are so different that the basic issue is still there. If your real data is less extreme than your example this might be enough.

Best,

Ista 

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[Alexander Shenkin]

Hmm, "width".  Why didn't they choose something that made sense?  ;-)

Thanks Ista.  I was about to say, "I wonder why I didn't figure that out before," but then I realized that the "width" argument isn't in geom_violin's help blurb.  Perhaps it should be put in?  Or, is there a standard set of arguments that don't get explicitly put in the help files?

Best,
Allie

[Ista Zahn]

Good question, I don't know where this is documented. I think I learned about width from the geom_bar example, but I don't see it actually described anywhere...

Best,

Ista