On Sep 27, 2012, at 5:59 AM, Alexandra Howe <ah...@st-andrews.ac.uk> wrote:

> Hello,
> 
> I have data which I have arcsin transformed to analyse.
> I want to plot my data with error bars however as my data is
> back-transformed my standard errors are uneven.
> Is there a simple way to draw these asymmetric error bars in R?
> 
> Thanks for your help.



See ?segments or perhaps easier, ?arrows with an 'angle = 90' argument.

Regards,

Marc Schwartz

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