[R] Size of R user base

[Kevin S. Van Horn]

Prof Brian Ripley wrote:

>>Conclusion:  Very few books sell to more than 12% of the population of 
>>potential buyers, and most books have a far lower penetration -- 1% or 
>>    
>>
>
>Where did you get that 12% from?
>

A booklet on assessing financial feasibility in nonfiction book 
publishing.  That's a general figure, so perhaps it doesn't apply if the 
book in question is a must-have, definitive reference for the group in 
question... like the book you mention (if it's the one I think it is).

> I have big problems with the definition. What is an `R user'? Someone  
> who has ever used R, even for a one-hour practical class? Someone who 
> has used R in the last 3 months?


Good question.  I guess I'd lean more towards your second definition, 
with the added caveat of "and expects to use it again in the next 3 months".