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List:       r-help
Subject:    Re: [R] Stacked geom_bar with aggregated SE -ggplot2
From:       John Kane <jrkrideau () inbox ! com>
Date:       2013-04-30 16:12:06
Message-ID: 3918A0291A6.000002DEjrkrideau () inbox ! com
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Hi Olvia, 
Welcome to the R-help list.

Are you seriously proposing to add error bars to a stacked barplot? Why?

 Do you mean a dodged barplot?

My first thought is that there probably are several better ways of presenting your \
data than stacked bar charts--I sometimes think that anything other than pie charts \
beats a stacked bar chart.

It might help to have some idea of what you are trying to do. We really need a \
concise statement of the problem in subject matter terms--probably a bit of an \
expansion on what you provided at the end of your post and then some example data and \
what code you have been working with.  Definately look at ?dput as a way to provide \
the sample data.

Have a look at https://github.com/hadley/devtools/wiki/Reproducibility for some \
suggestions on how to put frame a question for the R-help list.

John Kane
Kingston ON Canada


> -----Original Message-----
> From: olivia.burge@gmail.com
> Sent: Wed, 1 May 2013 00:20:59 +1200
> To: r-help@r-project.org
> Subject: [R] Stacked geom_bar with aggregated SE -ggplot2
> 
> Hi there,
> 
> I've been battling with an extension of this in my own data: getting
> appropriate error bars once data is stacked in a bar graph.
> (original question:
> http://r.789695.n4.nabble.com/ggplot2-se-variable-in-geom-errorbar-s-limits-
> td3311176.html). It wouldn't let me reply to that thread.
> 
> A modification of the earlier answer:
> data(diamonds)
> 
> diamonds_df <- ddply(diamonds, .(cut, color), summarise,
> mean_price = mean(price),
> se_price = sd(price)/sqrt(length(price))
> )
> 
> limits <- aes(ymax = mean_price + se_price, ymin = mean_price -
> se_price)
> 
> a<-ggplot(diamonds_df, aes(x = cut, y = mean_price, fill=color)) +
> geom_bar(position=position_stack(width=0.9))
> a
> 
> Then attempting to add error bars:
> a+ geom_errorbar(limits, position=position_stack(width=0.9), width=0.9)
> 
> I have tried:
> r + stat_sum_df("mean_cl_normal", geom = "errorbar"),  using the
> aggregation
> function in http://www.stanford.edu/~paunesku/, using ddplyr but haven't
> managed to work out a way of specifying the error bars to R.  In my case
> I
> would like to use an error bar analogous to each value of "cut" in the
> data
> example.   When I calculate the SEs appropriately ggplot2 won't stack.
> 
> This is first time posting and I've scoured the various forums and
> websites
> for a worked example.
> 
> In case it is relevant, my response variable is fitted germination of an
> lmer model ("germination"), x is a categorical variable (treatment, with
> 3
> levels), and I am using a categorical variable ("species") to stack.
> 
> Kind regards,
> 
> Olivia
> MSc student
> 
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
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