Interpretation of “stat_summary = mean_cl_boot” at ggplot2?

Question

a perhaps simple question I tried to make an errorgraph like the one shown in page 532 of Field\'s \"Discovering Statistics Using R\".

The code can be found here htt

Answer 1

Here is what the ggplot2 book on page 83 says about mean_cl_boot()

Function          Hmisc original        Middle Range
mean_cl_boot() smean.cl.boot() Mean Standard error from bootstrap

I think that it is the smean.cl.boot() from Hmisc package but renamed as mean.cl.boot() in ggplot2.

and here is the definition of original function from Hmisc package :

smean.cl.boot is a very fast implementation of the basic nonparametric bootstrap for obtaining confidence limits for the population mean without assuming normality