create a boxplot in R that labels a box with the sample size (N)

Question

Is there a way to create a boxplot in R that will display with the box (somewhere) an \"N=(sample size)\"? The varwidth logical adjusts the width of the box on the basis of sam

Answer 1

I figured out a workaround using the Envstats package. This package needs to be downloaded, loaded and activated using:

library(Envstats)

The stripChart (different from stripchart) does add to the chart some values such as the n values. First I plotted my boxplot. Then I used the add=T in the stripChart. Obviously, many things were hidden in the stripChart code so that they do not show up on the boxplot. Here is the code I used for the stripChart to hide most items.

Boxplot with integrated stripChart to show n values:

stripChart(data.frame(T0_G1,T24h_G1,T96h_G1,T7d_G1,T11d_G1,T15d_G1,T30d_G1), show.ci=F,axes=F,points.cex=0,n.text.line=1.6,n.text.cex=0.7,add=T,location.scale.text="none")

So boxplot

boxplot(data.frame(T0_G1,T24h_G1,T96h_G1,T7d_G1,T11d_G1,T15d_G1,T30d_G1),main="All Rheometry Tests on Egg Plasma at All Time Points at 0.1Hz,0.1% and 37 Set 1,2,3", names=c("0h","24h","96h","7d ", "11d", "15d", "30d"),boxwex=0.6,par(mar=c(8,4,4,2)))

Then stripChart

stripChart(data.frame(T0_G1,T24h_G1,T96h_G1,T7d_G1,T11d_G1,T15d_G1,T30d_G1), show.ci=F,axes=F,points.cex=0,n.text.line=1.6,n.text.cex=0.7,add=T,location.scale.text="none")

You can always adjust the high of the numbers (n values) so that they fit where you want.