[R-sig-eco] probability distribution for zero-inflated, right skewed data

[Johannes Björk]

Definitely looks promising. Thanks Bob!

On Jun 16, 2014, at 2:29 PM, Bob O'Hara wrote:

> On 16/06/14 13:57, Johannes Björk wrote:
>> Dear all,
>> 
>> Im looking into how to fit a GLM model (Im using rjags) with data that are heavily right skewed. In addition, some variables also zero-inflated. The data are species area distribution measured as "total area (km^2)" which is subsetted into "area in tropical zone" and "area in temperate zone". The last two variables contain zeros.
>> 
>> I have google zero-inflated models... and most that come up is "zero-inflated negative binomial" and zero-inflated negative poisson" for count data. I reckon I cannot use any of these distributions since my variables are not discrete.
>> 
>> Any pointer to which distribution(s) that might fit this kind of data would be much appreciated.
> I think a Tweedie distribution is sometimes used, but that always makes me think of escaping chickens. Recently this was published, which might also be useful: <http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12122/abstract>. They used BUGS, so you could ask them if the code is available. Even if it isn't, it shouldn't be too difficult to code up.
> 
> Bob
> 
> -- 
> 
> Bob O'Hara
> 
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