On 18/06/17 12:10, lily li wrote:
Hi R users,

I have a question about adding uncertainty bars to stacked bar plots.

DF:
   year   A   B   C   Amin  Amax  Bmin  Bmax  Cmin  Cmax
  2009  40  45  15   30      61       23       56      14       17
  2010  36  41  23   26      54       22       51      22       24

I use the code below:

DF.refm = melt(subset(DF[,c(1:4)]),id.vars='year',variable_name='Legend')

fig1 = ggplot(data=DF.refm, aes(x=year,y=value,fill=Legend))+
   geom_bar(stat='identity',size=.5)+ theme_bw()+ xlab('Year')+
ylab('Percent (%)')
print(fig1)

But I don't know how to change it a little bit. For example, how to add the
error bars on the plot, as is shown in the figure below? The error bar for
variable A ranges from Amin to Amax, the same applies to variables B and C.
Thanks for your help.


Your figure did not come through, at least not to me. You are probably doing something fancy, and the mailing list software stripped out the figure. *Do* learn to keep things simple. _Attach_ figures as *.pdf files, for instance.

That being said, to answer your question, my advice (and that of many others) is: DON'T. Error bars on boxplots (such plots are sometimes known as "dynamite plots" or "detonator plots") are considered by the cognoscenti to be abominations.

cheers,

Rolf

--
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276

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