[R] Arcsine transformation

[Ben Bolker]

On 13-09-22 09:25 PM, Peter Alspach wrote:
> Tena koe
> 
> I think you'll find the arcsine transformation is asin(sqrt(x/100))
> where × is the percentage.  However, it might be better to ask
> whether the data wouldn't be better analysed using generalised models
> (e.g., glm).
> 
> HTH ....
> 

  Good point about arcsine-sqrt, and about GLMs: specifically see

Warton, David I., and Francis K. C. Hui. 2011. “The Arcsine Is Asinine:
The Analysis of Proportions in Ecology.” Ecology 92 (1) (January): 3–10.
doi:10.1890/10-0340.1.
http://www.esajournals.org/doi/full/10.1890/10-0340.1.

  I think the title is a little silly, but it's worth reading.

> Peter Alspach
> 
> -----Original Message----- From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Ben Bolker Sent:
> Monday, 23 September 2013 12:54 p.m. To: r-help at stat.math.ethz.ch 
> Subject: Re: [R] Arcsine transformation
> 
> peake <peake.19 <at> osu.edu> writes:
> 
>> 
>> I am tryin to perform an arcsine transformation on my data
>> containig percentages as the dep. variable. Does anyone have a code
>> that I could use to do that? I am relatively new to R. Thanks for
>> your help!
> 
> asin(x/100)
> 
> ? or
> 
> asin(x/100)*2/pi if you want the results rescaled to (0,1)
> 
> curve(asin(x/100)*2/pi,from=0,to=100)
> 
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