[R--gR] Modelformulae: reference?

[Peter Dalgaard]

Friedrich.Leisch at tuwien.ac.at writes:

> >>>>> On Fri, 20 Aug 2004 08:12:34 +0100,
> >>>>> Steffen Lauritzen (SL) wrote:
> 
>   > Yes, I am sure this is right, thank you.
> 
> You're welcome.
> 
>   > It has no doubt developed a bit
>   > since then, possibly in a partly anarchistic way.
> 
> Yes, certainly. For S, the white book is the key reference.

...although much of the "anarchy" is probably of a later date. AFAIR,
the white book model formulas basically copies Genstat notation from
1977 for the lm/glm models (introducing the ~ operator and changing
"." to ":" is about the extent of it, I think), which in turn more or
less *is* Wilkinson/Rogers. Usage in other contexts and things like
the "|" for conditioning in coplot or strata() terms came in later. 

Of course the department copy of the white book is nowhere to be found
so I can't verify.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
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