[R] adding error bars

[David Winsemius]

Harrell's wiki/website has material on so-called "dynamite plots"

http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/DynamitePlots


Ben Bolker has a page on them as well:

http://emdbolker.wikidot.com/blog:dynamite

--  
David.


On Jan 26, 2011, at 1:26 PM, Joshua Wiley wrote:

> Hi,
>
> You will find package "sos" has some handy functions for searching for
> functions/packages:
>
> ###########################
> install.packages("sos")
> require(sos)
> findFn("error.bars")
> ###########################
>
> Perhaps the "psych" package has the error.bars() function you are  
> thinking of?
>
> As a side note, I am not sure it makes much sense to add error bars to
> a boxplot---it already includes 25th/75th percentiles (at least
> approximately, some use hinges, etc. but same general idea), and
> typically minimum and maximum scores.  What would the error bars add
> to that picture that would aid a viewer in understanding the
> distribution of your data or the difference between different sets of
> data?  In other words, is the information conveyed over and above the
> boxplots large enough to warrant the additional clutter, possible
> confusion, and necessary key/description in your figure caption so
> viewers know what they are looking at?  Just something to think about.
>
> Cheers,
>
> Josh
>
> On Wed, Jan 26, 2011 at 10:04 AM, ogbos okike  
> <ogbos.okike at gmail.com> wrote:
>>
>> Dear all,
>> I am trying to add error bars on a boxplot but have encountered an  
>> error as
>> indicated below. Is there a package I need to install or a library  
>> I have to
>> load before this goes please.
>> Thanks for any idea.
>> Ogbos
>>
>> x<-replicate(20,rnorm(50))
>>  boxplot(x,notch=TRUE,main="Notched boxplot with error bars")
>>  error.bars(x,add=TRUE)
>> Error: could not find function "error.bars"
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
> --
> Joshua Wiley
> Ph.D. Student, Health Psychology
> University of California, Los Angeles
> http://www.joshuawiley.com/
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT